Can an allergy give a high temperature. Allergy and subfebrile temperature

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Many doubts creep in: can there be a temperature with allergies, because this phenomenon is more typical for infectious or viral diseases than for allergies. Let's take a closer look at this situation.

What is an allergy?

Sneezing, itching, nasal congestion and skin rashes- symptoms by which people always easily recognize allergies, regardless of whether they met with its manifestations for the first time, or have been living with this disease for many years.

When the human body repeatedly encounters some kind of allergen (wool, pollen, dust, etc.), it acquires an increased sensitivity to this irritant, called sensitization. An allergy occurs when an allergen encounters a previously sensitized organism.

Because everyone's body individual person- this is a unique internal system, then people can react to the same stimulus in different ways.

So, when meeting with an allergen, one person may experience a severe condition up to anaphylactic shock and coma, while the same irritant passing by another human body will not cause the slightest symptomatology.

In humans, the following groups of irritants can cause allergies:

• drugs, mainly antibiotics of the penicillin series;
• food products (citrus fruits, nuts, seafood, eggs, etc.);
• stings of insects such as bees and wasps;
• pollen of various plants;
• dust and dust mites;
• chemicals (detergent, cleaning, creams, dishwashing detergents, etc.);
• vaccines, namely the proteins that it contains.

Based on the variety of stimuli, it turns out that the ways of penetration into the body and the strength of their impact are completely different. Therefore, clinical manifestations may be different.

human body temperature

This is the main indicator of the thermal state of both humans and animals. In man normal temperature body, when measured in armpit, is considered 35.6-36.9 ° C. During the day, a person's temperature can change by 0.5-1.0 ° C, and this is a physiological norm.

But with a significant drop or rise in temperature, extremely serious consequences for the body are possible. So, when the temperature drops below 35.5, there is inhibition of metabolism, a decrease in heart rate and blood pressure, loss of consciousness, and in the absence of help - death.

Unlike low, elevated body temperature is much more difficult for the human body to tolerate. When the thermometer rises to 42 ° C, all the proteins that are in the body under the influence of high temperature begin to fold. If such a person is not helped in time, then this condition can reduce the activity of the central nervous system which in turn will lead to death.

temperature for allergies

Although the clinical picture of allergies is very diverse, there are some signs that allow you to accurately distinguish allergies from other diseases.

Most people have a number of symptoms such as swelling of the nasal mucosa, coughing, watery eyes, redness and pain in the eyes, difficulty breathing, various skin lesions, and even headache.

But often the question arises as to whether there is a temperature with allergies. Temperature is not a mandatory symptom of an allergy, but under certain conditions it may increase.

Temperature with allergies in adults is extremely rare. However, if the human body is very sensitive to an irritant, then it can have a strong immune response and, as a result, an increase in body temperature.

In most cases, the thermometer rises with a drug (drug) allergy. This is explained by the fact that the volume of the injected drug is greater than the volume of insect venom or plant pollen. Also, all medical preparations are quite concentrated, which makes them more aggressive than food products.

If a person does not have a skin test for an allergy to this drug before prescribing it, this can lead to complications. So, against the background of complete well-being, after a dose of an allergen is administered, a person may suddenly develop shock, and then death.

There is also an innate sensitivity to certain allergens. This feature of the body can only be detected by special test studies in the immunological laboratory.

In such people, even small concentrations of a particular irritant, if ingested, can cause a strong allergic reaction, along with an increase in body temperature.

Temperature for allergies in children

The immune system of a child is not yet as developed as that of an adult. Children are more susceptible to various factors external environment. Allergies in children are in second place after colds among the most common childhood diseases.

Just like in the adult population, the question of whether an allergy can give a temperature in a child remains open. As in adults, so in children, an increase in temperature can be triggered by absolutely any allergen. In addition, given the weight of the child, a very small dose of the irritant can cause a strong allergic reaction with complications.

There are also cases when the temperature rises not in response to an irritant introduced into the child's body, but to a secondary infection that has joined.

If one of clinical manifestations the impact of an allergen on a child's body is pruritus, then when combing the rash, children can introduce an infection into the wound.

The body, starting an active fight against an infectious agent, includes all its protective functions, and one of these functions is hyperthermia. In this case, the presence of an infection in the child's body will be indicated by hyperemia around the wound, swelling of the skin and slight pain or discomfort at the site of the scratch.

Occasionally, there are cases that when combing the rashes, infection of this place did not occur, and the temperature still increased. This is due to the fact that in the body of each person there is a special regulator of some physiological processes - histamine. So, when characteristic rashes occur with allergies, histamine allows a number of other cells to penetrate to the site of inflammation, to speed up the healing process.

In addition, it should not be ruled out that a child may have two diseases at the same time. For example, with an expanded allergy clinic, initial signs flu, which just begin with the fact that a person has a fever.

In any case, no matter what reason provoked the symptoms of an allergy, including a rise in temperature, you should definitely consult a doctor to prescribe an adequate and safe treatment.

Man is recognized as the most complex creation on planet Earth, therefore, the reactions of our body to interaction with the environment can also be unpredictable. One of the unusual reactions of the body to interaction with the environment is an allergy, accompanied by a temperature.

So, let's understand together whether an allergy can give a temperature. The first mention of this disease dates back to the Middle Ages.

It was then that the rich and omnipotent Egyptian pharaoh Menes died after suffering from shock caused by an allergic reaction to a bee sting. In the 5th vein BC, Hippocrates was one of the first to describe some of the symptoms this disease. Initially, he suggested that asthma was exacerbated by exposure to cold. Then, Hippocrates noticed that eating cheese can cause severe consequences for some people, and attributed this to the body's unusual reactions to common foods.

In medicine, an allergy is understood as an increased sensitivity of the body to the effects of certain factors. environment(pollen, animal hair, citrus fruits, etc.). According to the data latest research, the problem of allergization of the population is quite acute. In total, today about a third of the entire population of the planet suffer from this unpleasant disease. The largest number of cases occurs in areas with poor ecology.

It is alarming that the frequency of allergic diseases in the world is increasing every year. Not the last role in this is played by the deterioration of the environmental situation, as well as the stress that we experience every day.

Allergies can be caused by things that are completely harmless at first glance: poor nutrition, house dust, insects, cats, and so on. Currently, the main causes of allergies are established:

• purity and sterility. It has been found that people living in countryside suffer from allergies much less often than residents of large cities. This is due to the fact that people who often come into contact with dust, dirt, etc. they receive, as it were, a vaccination and their immunity is able to cope with a variety of allergens;
• heredity of allergy. If the mother is allergic, then the likelihood of this disease in the child is quite high;
• unfavorable ecological situation;
• concomitant diseases (diseases of the liver, stomach, etc.);
• transfusion of donor blood;
• childhood infections are common.

Allergy symptoms

Allergies can manifest themselves in different ways, most often there are:

• breathing problems (running from the nose, sneezing, coughing, choking);
• vision problems (tears, redness of the eyes, burning, tingling);
• skin problems (flaking, itching, dryness, blisters);
• stomach problems (nausea, vomiting, diarrhea, constipation, abdominal pain);

In rare cases, an allergic attack can end in anaphylactic shock. In this case, loss of consciousness, shortness of breath, rash all over the body, convulsions, vomiting are possible.

Allergic reactions are often confused with the common cold. Indeed, many symptoms are similar - runny nose, cough, feeling unwell. The main difference between allergies and flu for many people is the presence of fever. It is believed that the temperature does not rise with allergies. Is it so?

Body temperature is an indicator of the thermal state of the human body. Normally, its indicator ranges from 35 to 37 degrees Celsius. If the thermometer rose higher, then it began inflammatory process.

And yet, can the temperature rise with allergies? The answer of doctors is unequivocal - yes, it can. In extremely rare cases, an allergy is accompanied by an increase in body temperature. This is due to the fact that the body is oversaturated with any allergen. This can happen when an allergic person, for example, is long time in contact with an allergen (cat, flowering plants, etc.), and the symptoms are accompanied by fever.

Reasons for the rise in temperature

An allergy may be accompanied by fever if it is caused by:

• intolerance to certain medicines;
• carrying out preventive vaccinations;
• the bite of some insects;
• prolonged exposure to pollen or dust;
• ingestion of protein in the body (with lactose intolerance).

To be 100% sure that the temperature increase is allergic manifestation, you need to remember the following: the temperature rises with allergies if:

• there was contact with an allergen that has already been established for you earlier;
• less than 1 hour has passed since exposure / contact with the allergen;
• in addition to chills, other symptoms appear - skin rashes, swelling, suffocation.

There are a number of signs by which you can distinguish a fever caused by SARS from an allergy.

signs	Allergic diseases	SARS, influenza
temperature increase	Increases only in cases of an acute phase of an allergy. The indicators change slightly: most often the thermometer stays at around 37.2-37.5 degrees, very rarely rises to + 38 C.	Temperature above 38 degrees
Reaction to antipyretics	temperature with allergies does not decrease after taking antipyretic drugs. Effectively helps to restore normal performance only their joint reception with antihistamines.	The fever subsides after taking antipyretics.
External manifestations	Runny nose, (mucus clear, odorless), sneezing, dry cough, redness of the skin, blisters (pimples).	Runny nose (mucus is clear at first, later thickens and becomes greenish yellow and bad smell).
How long do symptoms last	Pass quickly after taking allergy medications, the thermometer drops to normal.	The elevated temperature lasts for about 3 days. Symptoms weaken gradually (5-7 days).

Take care of your health carefully and seriously. If you notice an increase in temperature due to allergies, call your doctor immediately. Before his arrival, take antipyretics if the bar is above 38.5 degrees Celsius.

An allergic reaction manifests itself as a complex of symptoms (bronchospasm, sneezing, rashes, itching, swelling, runny nose, lacrimation). If the clinical picture is complemented by a high temperature, then they talk about atypical form diseases. Consider the causes of the condition, methods of treatment and preventive measures.

Can there be a temperature with allergies

Antigen-antibody binding starts the cascade chemical reactions, resulting in different symptoms:

• Peeling of the skin.
• Lack of appetite.
• Weakness.

An increase in temperature in this list can only be with a severe allergic attack with the appearance of somatic symptoms, which include tachycardia and profuse sweating. This requires the inclusion of many biological mechanisms and often the layering of infection. Powerful pyrogens are substances that raise the temperature. This category includes prostaglandins, interleukins and other chemical compounds.

Local inflammation is characterized by vasodilation and increased local blood circulation. A large affected area increases the concentration of pyrogens. When a certain level is reached, fever appears as part of the body's systemic response. Chill can also after blood transfusion and vaccination.

In the case of allergies, histamines are released into the internal environment, which are involved in metabolic processes and affect the entire body. They expand peripheral vessels, increase their permeability to phagocytes, helping the latter to be in the lesion and begin to neutralize pathogenic microbes. In addition, biogenic amines are itch mediators and participants in about 20 physiological processes, including inflammatory reactions. The result of this action is tissue hyperthermia.

Systemic temperature increase requires a large number of mediators of inflammation, which is no longer safe for humans. In this case, mercury jumps to 37.5 °C and not for long. Unless, of course, the causes of the condition are associated with pathogenic viruses, bacteria or fungi, as can be assumed from a fever lasting from 4 to 6 hours. Toxic substances released by infectious agents are also irritants of the immune system.

Seasonal allergy, for example, to poplar fluff is accompanied by an increase in temperature if contact with an abiotic environmental factor has been prolonged, and no measures have been taken to treat the condition. As a result, the secreted mucus is in the respiratory organs, which leads to inflammation and fever.

Associated symptoms

The clinical picture of the condition depends on the site of histamine release and the receptors with which the interaction occurs. If it increases capillary permeability, then saturation of tissues with liquid leads to edema, lacrimation, runny nose, sneezing develop in the mucous membranes.

Reasons for the rise in temperature

The essence of the mechanism of temperature increase in allergies is that histamine is contained in the hypothalamus and is involved in the regulation of the following processes:

• Appetite.
• Sensitivity to pain.
• The sleep-wake cycle.
• Body temperature.

The main risk factors leading to fever due to allergies include associated infection. Often this happens in children with rubella. Antipyretic compounds help from it. For chickenpox characterized by a rash of small blisters that disappear on the 3rd day.

With the development of dizziness in babies, dry mouth, abdominal pain, nausea, it is recommended to immediately consult a doctor. And an elevated temperature can be a sign of the penetration of a potentially dangerous irritant. Children are given antihistamines:

• Claritin.
• Suprastin.
• Diazolin.

To deactivate a toxic substance, eliminate acute inflammation corticosteroids are prescribed. The condition improves after taking enterosorbents, which cleanse the blood of toxins. It is also useful to drink plenty of spring water without gas. The main thing is not to self-medicate, but to visit a doctor, even if the condition has improved.

Insect bites

Ants, mosquitoes, midges and other arthropods use poisons for their own protection, many of which are protein compounds. An increase in temperature, sometimes up to 39 ° C, is defensive reaction organism, contributing to the denaturation (destruction) of these toxins.

With hypersensitivity on bees weighed down allergic history with elevated immunoglobulin titers, a condition develops, which often takes the form of a rapid violent reaction, supplemented by the following symptoms:

• Eruptions.
• Intense itching.
• Swelling of the airways.
• Burning.
• Drop or increase in pressure.

A severe form, leading to an increase in lymph nodes, develops in children. It requires at least a medical consultation.

food allergy

The immune response to food is the least aggressive. Therefore, it rarely leads to a significant increase in temperature, up to a maximum of 37.5 ° C. This happens if in parallel a person is worried about:

• Discomfort in the abdomen.
• Persistent diarrhea.
• Vomit.

The reason is related to the content of food coloring or monosodium glutamate in food.

Medicines

The considered form of allergy is dangerous. The reason is large, compared with pollen, doses of administered medications. Some of them inhibit the activity of enzymes that catalyze the reaction of histamine biotransformation. AT healthy body this process is controlled by enzymes secreted by the intestines. If drugs disrupt the functions of the digestive canal, then there is a failure in the metabolism of the amine. The temperature rises with allergies to a number of medications:

• X-ray contrasts.
• Cephalosporins.
• Aspirin.

In order to improve tissue respiration in newborns, they are used to treat Cytochrome C, an enzyme preparation, which often leads to excruciating fever and chills. Unbearable itching, general malaise occurs after using Lekozim - a composition well known to traumatologists.

Treatment with sulfonamides, Metronidazole, Tetracycline on the 9th day can cause allergic reaction with large red spots on the body, high fever and even defeat internal organs. With timely measures taken, the prognosis of the condition is favorable without complications.

The use of quinidine antibacterial agents also often gives an allergic reaction with temperature. Lyell's syndrome, accompanied by a rash that gradually transforms into vesicles, and after opening into erosion, can also be attributed to this category. This requires urgent resuscitation.

Discontinuation, albeit short-term, of the use of drugs can relieve discomfort. The temperature, no matter how high it is, is a more favorable symptom compared to the development of anaphylactic shock.

hay fever

The reaction to fluff, wool, pollen, flowering ragweed is accompanied by:

• Rhinitis, sometimes year-round.
• Lachrymation, cough.
• Temperature rise to 37.5 °C.
• Severe asthma and bronchitis.

If bacterial conjunctivitis, otitis or sinusitis develops, the thermometer readings can rise to 39 ° C. With atypical immune response symptoms are stopped by antihistamines, sprays with glucocorticosteroids in the composition. Procedures for washing the eyes and nasal cavity are carried out. It is possible to involve an ophthalmologist and an ENT doctor.

Serum sickness

The condition develops in response to the administration of animal proteins. Along with a temperature increased to 38 ° C, the following appear:

• Strong headache.
• Sweating.
• Itchy eruptions.

If the introduction of histamines relieves unpleasant symptoms, then the temperature increase is associated with the struggle of the human immune system with foreign bodies. If the thermometer readings have not changed, there is a concomitant disease that needs to be identified and treated. The absence of this can provoke anaphylactic shock and death of the patient.

Allergies are also earned when using various cosmetics: varnishes, hair dyes, toilet water.

Temperature for allergies and colds - how to distinguish

On the initial stage these conditions have similar symptoms. But allergies can last for a year, and a cold lasts a maximum of a week. The reaction develops rapidly, 20 minutes after contact with a foreign agent. Infection can be recognized by severe weakness, body aches, yellow-green discharge from the nose, while clear water flows out during an immune response.

What to take with a high temperature

The temperature during allergies rises to a certain level. Depends on the following factors:

• Individual characteristics of the patient, his age.
• Concomitant diseases accompanied by fever.
• Etiology of an allergic reaction.

Visiting a specialist, clarification true reason pathology, the rejection of the stimulus will relieve the symptoms of the immune response. Good old remedies help someone: tea with the addition of milk, honey, raspberries, lemon, but on the condition that there is no similar answer to these products.

When to Call a Doctor

Temperatures up to 38 °C usually resolve on their own. If this mark is passed, and the person has breathing problems, dizziness, nausea should urgently apply for medical care . It is better to show the child to the doctor immediately in order to prevent a serious pathology that only resembles an allergy. The doctor prescribes antihistamines:

• Levocetirizine tablets (10 mg). Contraindicated in pregnancy, lactation, children under 6 years of age and patients with kidney disease. From side effects may increase appetite, nausea, vomiting, itching.
• Zyrtec drops for children from 2 to 6 years old.
• Hifenadine. Possible sedation, dyspeptic disorders.
• Loratadine- fast-acting composition. Release form: syrup and tablets. Contraindicated in pregnancy in the first trimester.

Anaphylactic shock is a condition that requires urgent medical intervention, sometimes in the intensive care unit. He is recognized by the following signs:

• Reddened or pale skin.
• Thready pulse.
• A sharp drop in blood pressure.
• Loss of consciousness.
• Labored breathing.
• Increased sweating.
• General malaise.

In connection with the intake of pharmacological drugs, a fatal outcome is possible. Consultation with the attending physician about the rules of first aid during anaphylaxis will help the parents of an allergic person to save the child's life. Allergies should not be perceived as something unworthy of attention, otherwise they become constant companions:

• Dermatoses.
• Conjunctivitis.
• Rhinitis.
• Hives.
• Bronchial asthma.

Given that timely treatment the prognosis is favorable.

Prevention

The main thing is to avoid contact with the allergen. When reacting to dust, wet cleaning more often, if the irritant is wool, abandon pets. Take insect repellent sprays with you when you go out into the countryside. Do not abuse sunbathing, so that overheating is not added to itching and redness of the skin.

Doctor's conclusion

temperature for allergies- a sign that cannot be ignored both in an adult and in a child. Only an experienced doctor can understand pathological condition, to find a balanced solution that completely eliminates the disease or compensates for the symptoms.

If you are allergic to any medicinal product, its reception can provoke a sharp increase in body temperature, aggravated by severe intoxication, skin and inflammation of the mucous membranes. A similar effect can be observed with food allergies, which, in addition to temperature, is usually accompanied by acute pain in the abdomen and a variety of rashes. Also, an increase in temperature is caused by the body's reaction to a foreign protein, plasma and serum.

This type of allergy can lead to anaphylactic shock and death - regardless of the presence of temperature.

A slight rise in temperature is noted for animal hair and plant pollen. In this case, a runny nose and inflammation of the mucous membrane of the eyes are additionally observed. After the bites of some insects, the appearance of temperature is explained by the inflammatory process in the body. Redness also usually occurs at the bite site - with a severe allergic reaction, there may be an increase in pressure or pulmonary edema.

What to do with an allergic temperature

A severely elevated temperature caused by an allergic reaction requires immediate medical attention. The attending physician will prescribe necessary analyzes, identify the cause of the fever and prescribe in the form of drugs or. A slight increase in temperature (up to 37.5 degrees) does not require special measures - it is enough to take the usual antihistamines type "Claritin" or "Suprastin".

Also, to bring down a low temperature and stop the inflammatory process, you can use corticosteroids by drinking a course of such drugs.

With an increase in temperature caused by taking any drugs can aggravate the patient's condition. It is also categorically contraindicated to bring down the temperature by rubbing with warming tinctures and steaming the body. These procedures will help with, but will harm if an allergic reaction is present in the body.

It's safe to knock down low allergic temperature drinking in the form of tea with raspberries, lemon, milk or honey will help. However, with food allergies, you need to be careful with any drink and food, since the product that is an allergen is not always known to an allergic person, and its use can lead to serious complications.

There is a well-known opinion according to which fever is a sign peculiar only to infection; moreover, its presence indicates that a person definitely does not have manifestations of individual sensitivity. However, this is not entirely correct - much depends on the form of the disease, the severity of the course and other factors. Read more about whether there is a temperature with allergies and what place fever takes in the mechanism of development of immune intolerance, read the article.

Most often, you have to think about this with a runny nose, which at the initial stage of manifestations resembles both the symptoms of individual sensitivity and the picture viral infection. Congestion due to edema, watery transparent selection, itchy nose and sneezing all add up. Therefore, the reference point is body temperature. If the readings on the thermometer overcome the mark of 37 ° C, the diagnosis is clear. Or not?

In fact, allergies and temperature are not at all incompatible concepts. Fever often accompanies forms of individual immune sensitivity - for example, such as:

1. Quincke's edema.
2. allergic rhinitis.
3. Pollinosis.
4. Toxicoderma.
5. and etc.

Thus, the presence elevated temperature body cannot serve as a basis for excluding the diagnosis of allergy.

Causes

Fever is a typical pathological process. It develops according to certain laws and is both a form of the body's response to stimuli and a way of protecting against them. Its occurrence can be caused by a change in the “settings” of the thermoregulation center - that is, a shift in a special thermal setting point by more high level. This happens under the influence of substances called pyrogens. They are divided as:

• primary (viruses, bacteria and other agents that can provoke an immune response - antigens);
• secondary (cytokines (interleukin1a, etc.) - specific proteins that affect the center of thermoregulation)

Antigens are substances that are perceived immune system as alien; they must be defended against - this is the goal of each stage of reactions. Of course, if the mechanism works adequately, this applies only to infectious agents and some other agents that can damage the body; immunity is tuned to identify and destroy them. With distorted sensitivity, aggression is also directed against house dust, animal hair, and cosmetics components; they, like primary pyrogens, activate protective cells, cytokines are released - inflammation and fever occur.

Features of manifestations

Having refuted one erroneous opinion - that there are no febrile reactions with individual intolerance, one should proceed to the second, no less common. It says that the temperature in the case of allergic pathologies does not exceed subfebrile indicators - that is, it is in the range of 37.1–37.5 ° C. This is possible, but does not rule out the possibility of a higher fever. In addition, there are several forms of allergy for which fever is a classic component. clinical picture Let's look at them in turn.

hay fever

This is a pollen allergy that manifests itself:

• nasal congestion;
• redness of the eyes, tearing;
• itching and swelling of the eyelids;
• sneezing, etc.

It is seasonal in nature (occurs during the flowering period of causally significant plants: ragweed, wormwood, etc.). There is no fever or it is within subfebrile values. High happens only with pollen intoxication - this is an option severe course diseases in which patients are concerned about:

• weakness;
• dizziness;
• loss of appetite;
• sleep disturbance.

Body temperature rises to 38–39 ° C, while chills are also observed, a sharp deterioration general condition, decreased performance, fatigue.

Toxicoderma

It is an acute inflammatory process provoked by contact with allergens, which simultaneously have the properties of toxins, that is, poisons. They enter the body:

1. By inhalation.
2. When swallowed.
3. When making injections.
4. When administered into the rectum, vagina (rectal, vaginal).

Pathology manifests itself:

• skin rash (vesicles, blisters, spots, nodules);
• itching, swelling;
• general weakness;
• in severe cases - nausea, vomiting.

Toxicoderma is very often medicinal - that is, it develops in response to the use of pharmacological drugs (antibiotics, sulfonamides, procaine, etc.). It is divided into three degrees, and fever accompanies all but the first. With moderate damage, the temperature is subfebrile, and with severe damage, it can rise to 38–39 ° C or more. At the same time, the possibility of infection can not be ruled out - for example, due to scratching areas of the rash.

This defeat skin and mucous membranes, with the development of which the following symptoms occur:

1. Intense itching.
2. Edema.
3. The appearance of blisters of pink, red, porcelain hue.

Elements of the rash appear suddenly and, as a rule, without symptoms, "harbingers". They can be localized on separate areas (including the soles, palms, scalp) or cover the entire body (general or systemic form). At acute pathology exist no more than 24 hours; disappear quickly, without scarring, secondary skin changes.

Urticaria blisters can merge into single lesions and always turn pale when pressed.

An increase in body temperature (from 37.1 to 39 ° C) appears simultaneously with the onset of a rash and is called "urticaria fever". However, this symptom accompanies only system form pathology. After the resolution (that is, the disappearance) of the blisters, it also stops (stops).

Quincke's edema

It is swelling of tissues in the area:

• external genital organs;
• mucous membranes - nose, pharynx, larynx, trachea, stomach, etc.

Edema is formed quickly enough, while there is no itching, and the symptoms depend on the localization. So, when located in the larynx, a cough occurs, phenomena increase respiratory failure, and with damage to the digestive tract - nausea, vomiting, etc. Fever, as with urticaria, does not precede edema, but is included in the spectrum of vivid symptoms after it occurs, is in the range of 37.1–39 ° C and disappears when the process is resolved .

Serum sickness

Pathology that became known only with the start of mass production of prophylactic and therapeutic media necessary to prevent or suppress the development of infectious processes - a variety of vaccines, sera, monoclonal antibodies and others. It is an example of an immunocomplex allergic reaction, characterized by such signs as:

• skin rash;
• swollen lymph nodes;
• burning, itching, swelling, redness in the injection area;
• swelling, pain in the joints;
• nausea, vomiting, etc.

What will be the fever depends on the severity of the course - if the serum sickness is mild, it is at the level of 37.5-38 ° C for 2-3 days. The patient's condition is considered satisfactory. In the second degree, the temperature reaches higher numbers (38–39 ° C) and persists for 1–2 weeks. In severe cases, signs resembling an infection appear:

• redness of the eyes and mucous membrane of the pharynx;
• rash all over body;
• severe weakness.

The temperature is high - 39-40 ° C, observed for a long period of time, exhausting the patient.

Infectious Fever and Allergy: What's the Difference?

Many readers, having read the information in the previous sections, may come to the conclusion that it is rather difficult to distinguish clear differences. This is true; besides, a number of habitual statements concerning a fever are doubtful. For example, the level of increase, which is often taken as a criterion for the severity of the course of the disease, is actually very subjective and depends on the prevalence of the process (local, or local or systemic), age, and the patient's health status. For example, fever with allergies in children is more common than in adults. It is more convenient to describe the most significant nuances in the table:

Fever as a symptom	Pathological process
	Allergy	Infection
Body temperature increase, °C	Normal values ​​or increase to 37.1-38. More - only with a systemic process, severe course.	On average, from 37.5 to 39 ° C.
Persistent, lingering character	It is characteristic of hay fever, serum sickness, toxicoderma.	High fever is observed at the beginning of the process, during the period of resolution it disappears; if not, you should think about complications or additional pathologies that were not immediately taken into account.
The presence of manifestations - "harbingers" (prodromal period)	No, the onset of the disease is often sudden, acute, and a clear connection between disorders and contact with a provoking substance is often noticeable (if we are talking about immediate type hypersensitivity).	Yes. This stage of the development of the disease is intermediate between two periods: initial (infection, incubation) and manifest (height, vivid manifestations).
Possible accompanying symptoms	Rash, itching, redness, swelling of the skin and mucous membranes, nasal congestion, combined with repeated, sometimes uncontrollable sneezing. Bilateral eye damage, severe swelling of the eyelids. Allocations are watery, abundant without impurities. With asthma - shortness of breath, coughing fits (dry or with a small amount of transparent "glassy" sputum). Violation of the general condition in the form of severe weakness, drowsiness is rare (as a rule, in severe cases).	Burning, dryness, tingling of the mucous membranes of the nose and throat, occasional sneezing. The cough is dry, obsessive or wet, with purulent discharge. The presence of pain - intense headache, as well as when swallowing, in muscles and joints without a specific localization and in other areas involved in the process. If the eyes are affected, then usually at first on one side, with severe redness, the presence of pus. Severe malaise is almost always characteristic, associated with the syndrome of systemic infectious intoxication.

When evaluating objective signs fever, it is important to remember that there are not only isolated, but also combined processes.

The infection may precede an allergic reaction to the antibiotics the patient is being treated with, or may occur when the patient scratches itchy areas of skin to bleed. Therefore, it is worth considering probable causes violations on all sides.

What should be the treatment?

When planning an algorithm of measures designed to improve the patient's well-being, it should be understood that allergy is a process that affects many functional systems of the body. Fever is only one of the symptoms, and it is useless to treat it separately, unless the underlying disease is affected.

How to achieve recovery? Several methods are used:

1. Stopping contact with the allergen (for example, changing the drug that caused the symptoms or moving to an area where there is no flowering of plants with dangerous pollen).
2. Diet (based on the exclusion from the diet of foods that often provoke reactions - citrus fruits, tomatoes, mushrooms, etc.).
3. Drug therapy (carried out with the help of antihistamines (Cetrin, Zirtek), glucocorticosteroids (Prednisolone, Elocom), cromones (Ketotifen, Zaditen) in the form of tablets, ointments, injections).

In the case of the development of some forms of allergies, enterosorbents (Multisorb, Atoxil), diuretics (Furosemide), non-steroidal anti-inflammatory drugs (Nimesil, Indomethacin) are required. The last group of drugs has an antipyretic effect, but they should be used only when there is no other way to fight the fever. If we are talking about a temporary increase in temperature to subfebrile values ​​​​(for example, with urticaria or hay fever), these drugs are useless.