home Consultations Time temperature 37 2. Low-grade fever due to infections. Danger of elevated temperature

Time temperature 37 2. Low-grade fever due to infections. Danger of elevated temperature

THERE ARE NO SYMPTOMS OF THE DISEASE, BUT THE THERMOGIST STILL SHOWS 37.5°. WHY?

Doctors call a low (from 37 to 38°C) but constant body temperature subfebrile. At first glance, there is no reason to worry. Even healthy person it changes throughout the day, decreasing in the morning and reaching its maximum in the evening. But if the elevated temperature persists for a long time, it’s worth looking for reasons.

The first thing to do in this case is to check the devices

Make sure the thermometer is working properly. To do this, simply measure the temperature of others. It is also important that the armpit is not wet. By the way, in the left armpit the temperature is often 0.1 - 0.3 degrees higher than in the right. This also needs to be taken into account.

If, nevertheless, you are convinced that everything is in order with your thermometer, then the reasons elevated temperature can be.

1. Lack of iron

Anemia is another one possible reason low-grade fever. With low hemoglobin the immune system too tense, which leads to an increase in temperature. In addition, a secondary infection often occurs with low hemoglobin.

2. Hormonal problems

Hyperfunction thyroid gland often causes a persistently elevated temperature. Excess thyroid hormones in the blood leads to disorders energy metabolism. Associated symptoms- sweating, nervousness, palpitations, fatigue, weight loss. A blood test to measure the level of thyroid hormones helps clarify the diagnosis.

3. Everything from nerves

Prolonged low-grade fever may be a consequence of overexertion. It can remain elevated all the time while a person is under stress, and even be accompanied by chills, headache, and shortness of breath. If you take a sedative or change the environment, the temperature will normalize. Low-grade fever also occurs in adolescents, people of asthenic physique and young women prone to vegetative-vascular dystonia.

4. Physiology

Hot tea, a hearty lunch, intense physical activity - all this can cause an increase in temperature by 0.3-0.5 degrees. The menstrual cycle also affects it: during ovulation and in the second half of the cycle, the temperature also rises slightly.

5. Temperature tail

Sometimes after bronchitis or a sore throat, the temperature remains elevated, although the tests are normal. That’s what they call it: “temperature tail.” This is a kind of reaction of the body to the disease. Usually after 1-2 months the temperature returns to normal.

6. Chronic infection

Low-grade fever can be caused by sinusitis, tonsillitis, inflammation of the appendages and even caries that are not completely cured. As a rule, a blood test helps clarify the picture - it will show the presence inflammatory process. It is enough to wait until the temperature returns to normal. Also, low-grade fever is often the only symptom of toxoplasmosis.

Called low-grade fever or low-grade hyperthermia. But if the temperature of 37℃ in children is already whole month, then this is most likely contributed to serious reasons, which cannot be ignored.

But on a short time A child may have such thermometer readings for obvious reasons:

after physical activity;
in a hot room with dry or very humid air;
as a result of stress;
after plenty of intake food;
due to too warm clothes.

But if it stays from 37.1 for a month, then this can no longer be considered normal reaction on external conditions. Need to find internal cause. Some signs, as well as a good pediatrician, who in this case should definitely be contacted, can suggest it.

Infectious causes of temperature 37-37.9℃

Long-term persistence of values of 37.2 and close to it often indicates the presence of latent focal inflammation or infection. Features of low-grade fever of microbial origin:

diurnal changes are well expressed, for example, 37.1 in the morning, 37.9 in the evening;
the child’s well-being noticeably deteriorates,
easily knocked down by antipyretics.

Usually the temperature is not brought down to 38.5, but there are many exceptions to this rule: nervous and other chronic diseases, tendency to seizures.

Not only the thermometer readings, but also the deterioration general condition child and other alarming signs should be those “bells” that cause concern and understanding that this is a disease that requires seeing a doctor.

Diseases that may be accompanied by a temperature from 37 to 37.9 and above during the month

Cause	Associated symptoms	What is the most common temperature?
Pulmonary tuberculosis	General weakness, sweating, loss of weight and appetite, increased fatigue, prolonged coughing attacks.	37.3 to 37.9℃
Sinusitis	Pain on the sides of the nose, especially when pressed.	37.2 to 37.8℃
Chronic tonsillitis	Sore throat, redness	37.1 to 37.9℃
Stomatitis	Redness and itching of the oral mucosa, white coating.	37 to 37.3℃
Chronic cholecystitis	Pain on the right under the ribs, nausea, bitterness in the mouth.	37.1 to 37.7℃
Pyelonephritis, cystitis	There may be no other symptoms at all. Possibly more frequent or painful urination, the color of urine changes.	37.2 to 37.8℃
Myocarditis	Heartache. Pale grayish skin, shortness of breath.	37.3 to 37.9℃
Giardiasis	Frequent liquid foamy stool, grinding teeth during sleep.	37.2 to 37.5℃
Brucellosis in mild form	Head, muscle, joint pain. Enlarged and painful lymph nodes.	37.3 to 38℃
Hidden Current toxoplasmosis	Liver enlargement lymph nodes, spleen. Pain throughout the body, rash. Strabismus or clouding of the lens.	37.5 to 37.9℃
Intestinal helminthiasis	Pale, emaciated. Disturbances in bowel function, sleep and mood. Headache.	37.1 to 37.3℃

Sometimes fever persists for up to two months after influenza and ARVI. This phenomenon is called the temperature tail. If with such hyperthermia the blood and urine tests are normal, then it does not require special treatment and gradually goes away on its own.

If not an infection

A temperature of 37.1 or higher can last a month or longer for many diseases in children that are not associated with germs. Here is an approximate list of them:

autoimmune diseases, in which one’s own tissues and organs are perceived by the immune system as foreign:
- rheumatoid arthritis,
- diabetes first type,
- systemic lupus erythematosus,
- autoimmune thyroiditis and hepatitis,
malignant tumors,
iron deficiency forms of anemia.

Features of temperature in non-infectious diseases:

fluctuations during the day are weakly expressed or are disrupted from the pattern. For example, in the evening it is lower than in the morning,
is not affected by antipyretics.

Low-grade fever may have a psychogenic origin, that is, associated with the characteristics of the nervous system and conditions social life child. Temperature from 37.1 to 37.6 without visible reasons occurs in children who are characterized by:

unsociability;
irritability;
isolation;
suspiciousness.

Such a child must be treated with care and caution so as not to traumatize his fragile psyche. Long-term hyperthermia can be caused by fear, despair, longing for loved ones, anticipation of something important, any strong emotions or significant events, even positive ones.

Long-term neurogenic fever can manifest itself in diseases of the nervous system; drug-induced fever can occur due to long-term use certain drugs, post-traumatic after operations and severe injuries.

A special case is constitutional or growth subfebrile condition. This is when a child, during periods of his active growth at feeling good the temperature rises to 37.3, sometimes higher. It lasts up to 3-4 months, and then returns to normal on its own.

How to measure correctly?

A child under 1 year of age produces 2.5 times more heat per kilogram of weight than his parents. For an adult, the thermoneutral zone, that is, a comfortable temperature with a naked body, is 27-29℃, and for an extremely lightly dressed child aged 1 year, 18-22℃. Therefore, babies easily overheat. And if every time you measure the temperature in a room with warm, dry air in a thoroughly dressed baby, you can get the illusion that the temperature of 37-37.5 does not decrease - even for a month, even for a year.

To identify the real picture, you need to put the thermometer in the morning, afternoon and evening time 14 days in a row. Record the results every time. Monitor other symptoms closely. And then consult a doctor with this information.

The pediatrician should give a referral for urine and blood tests, possibly stool, and mucosal swabs. And only after this will it be possible to determine the exact cause of prolonged low-grade fever with “fuzzy” symptoms.

But this does not mean that the baby should not be given any help until the diagnosis is made. At a temperature of 37 to 37.9, if it lasts a month or longer, there is a danger of dehydration and depletion of defenses. Therefore, it is necessary to create conditions under which this test of immunity will be more easily tolerated:

to be in the fresh air than younger child, the more often;
provide rich in vitamins and microelements nutrition;
give warm drinks often;
create favorable conditions in a room with a temperature of 18-22℃ and a humidity of 45-70%.

If your body temperature rises above 38 degrees, then you most likely have caught a cold. But sometimes it also happens that the body temperature seems to be low - 37, but it lasts for several days or even weeks. Experts call this temperature low-grade, and sometimes it can indicate very serious problems with health.

Low-grade body temperature

If your body is like “wool,” your mind is shackled by apathy, and your temperature has been 37 for a week, you need to figure out the reasons why you are in such a deplorable state. Under no circumstances should you panic and call hospitals for an ambulance.

But this condition should not be ignored either. You need to analyze everything, and then you can calmly go to see a therapist.

Low-grade fever causes

1. The most common source of low-grade fever is an incipient cold. A person, as a rule, also feels other symptoms of illness - sore throat, muscle aches, cough, headache, rhinitis, etc.

This temperature may also persist for some period after past illness, when the main symptoms of infection have been eliminated, but the body is recovering gradually, so regulatory processes have not yet returned to normal.

2. Sometimes a condition called thermoneurosis also occurs. Under heavy loads, stress, sudden changes in clock and climatic zones thermoregulation may fail. This may happen more often in childhood. But in people with unstable, mobile vegetatives (vegetative-vascular dystonia), thermoneuroses are often observed as a reaction to external influences.

3. If, along with an increase in temperature, discomfort and your stomach is churning, food disgusts you, and you practically don’t leave the toilet, it means intestinal infection. It is this that can make the temperature last for several days.

4. Elevated temperature may be the result of a psychogenic effect on the consciousness of surrounding phenomena and objects. As a result, you get intense experiences, anxieties and fears that can provoke a painful state.

5. The temperature may also not subside due to a typical fever, which often portends an exotic disease brought from abroad. Under no circumstances should you panic, because this will not improve the situation. In this situation, it is necessary to urgently contact an infectious disease specialist for necessary tests and treatment.

6. Constant temperature 37 may be a sign of acquired or congenital hyperthermia, the causes of which can be determined by a qualified specialist.

8. Long-term fever may also cause swelling – malignancy. Therefore, it is better to be on the safe side immediately and consult a doctor to rule out the possibility of such options. You will be sent to the oncologist's office and for laboratory tests.

9. A temperature of 37 may not subside for a week due to autoimmune changes. It is also recommended to visit the hospital and get checked for possible availability deviations in the functioning of body systems - exclude rheumatoid conditions, changes hormonal balance and thyroid dysfunction.

Other causes of low-grade fever

1. Low-grade fever often occurs with pneumonia or pneumonia. After the postponed colds people often notice that the temperature stays at 37, there is shortness of breath and a characteristic cough. For staging accurate diagnosis The doctor needs an x-ray of the lungs.

The picture will show everything and confirm or rule out the presence of inflammatory processes. If you have similar symptoms, consult a physician, because pneumonia is quite serious illness, especially if left untreated.

2. Neuroinfection. There are infectious pathogens that can infect the central nervous system. The hypothalamus, a special part of the brain, is responsible for regulating our body temperature. When neurotropic viruses penetrate the body, this part of the brain can be “damaged,” which leads to disruption of the body’s thermoregulation.

Other symptoms of damage to the hypothalamus by viruses include increased fatigue, irritability, possible problems with sleep. In this situation, the help of a therapist is necessary, because with the help of blood tests you can find out whether there is or not viral infection, and, if necessary, begin treatment.

3. Traumatic brain injuries. They often lead to concussion, and low-grade fever may also be present. In case of a head injury, in any case, you must consult a neurologist and remain calm. Otherwise, everything can end in inflammatory processes in the arachnoid membrane of the brain.

A concussion can be diagnosed using an MRI, based on the results of which the neurologist prescribes drugs that stimulate metabolism nerve cells and thereby helping them recover faster. Symptoms of a concussion also include headache, dizziness, nausea, a feeling of weakness in the body, increased sweating, tinnitus, and sleep disturbances.

4. Hyperthyroidism. This is a disease in which increased production thyroid hormones. This leads to increased metabolism, which accordingly provokes an increase in body temperature.

In the future, a person may begin to experience tremors when their hands tremble, tachycardia, irritability and increased sweating. If such symptoms are present, you should consult an endocrinologist.

Temperature 37 lasts a week

If you feel normal, but the temperature of 37 degrees lasts for a week or even longer, it is quite possible that this condition is common for you. A temperature in the range of 35.7 – 37.2 is considered normal.

Perhaps this is good news

A slight increase in temperature can be caused not only by negative, but also by positive reasons. The fact is that the cause of the increase in temperature may well be pregnancy. This can be determined with a test or blood test. During pregnancy, low-grade fever can accompany a woman even throughout the entire pregnancy.

Both the body’s individual reactions to pregnancy and acquired ARVI symptoms can play a role here. Self-medication in this case is fraught with consequences, so you need to safely go to a gynecologist or pharmacist for a consultation to choose the right drug if necessary.

But in general, sometimes a temperature of up to 37.3 in pregnant women is considered normal, and it can either constantly remain at this level or periodically rise to this value.

What to do if you have a low-grade fever?

As mentioned earlier, consultation with a doctor is necessary, since the causes this state are purely individual, just like the ways to solve them. In this case, the doctor must prescribe a urine and blood test. General analysis blood usually clearly shows whether there are any hidden processes active in the body that you should be aware of.

If a low-grade fever is observed in small child, you must definitely call a doctor to rule out developing disease. However, at the same time, it is necessary to consider whether the child is teething or has recently been vaccinated. If the child is older, attention should be paid to whether he was overexcited at the holiday, whether he overworked himself at school or a section, etc.

Unfortunately, adults are not inclined to seek help for such problems. high temperature. In this case, we can advise the following: do not take antipyretic medications. You can do something to boost your immunity - introduce fruits rich in vitamin C into your diet, for example, relax and get enough sleep, because it could just be overwork.

If the temperature is accompanied by other symptoms - diarrhea or inflammation of the upper respiratory tract, for example, you will need to be treated by a specialist.

Danger of high temperature

A temperature of 37.0–37.9 is called subfebrile. An increase in indicators is a response of the immune system to penetration into the body pathogenic microorganisms. At long stay pathogens in the body, severe intoxication develops - rashes appear on the skin, the functioning of the liver and kidneys is disrupted, since the organs have to intensively cleanse the body of toxic substances. At high temperatures it occurs oxygen starvation– the brain and heart suffer from oxygen deficiency, which negatively affects performance and the condition of the body as a whole.

A slight increase in temperature is not the only sign of a cold or other illness. Hyperthermia is accompanied by cough, runny nose, cephalalgia, muscle and joint pain, weakness, vomiting and diarrhea. But colds, enteroviruses and rotavirus infections rarely last more than a week. If low-grade fever is observed for a long time, it is necessary to undergo a thorough examination to establish the exact cause and begin treatment.

Important! With prolonged hyperthermia, the human body gradually stops responding to elevated temperature values, all symptoms of the disease may disappear, but pathological processes continue, the immune system is working hard. A crisis can come suddenly - the indicators will rise sharply, to a critical level, which will significantly worsen the patient’s condition.

An increase in temperature every day for several weeks or a month to 37.2–37.5 degrees without other manifestations of disease is a sign of various serious infectious and non-infectious pathologies.

Natural

One of the most common causes of hyperthermia is measurement errors. Cheap electronic thermometers often break down and show incorrect values. Not immune from errors and mercury thermometers. Therefore, if prolonged hyperthermia without symptoms is observed, it is necessary to measure with another device.

Causes natural increase temperatures:

normal state - moderate hyperthermia in many people is observed constantly throughout life, while all other health indicators are normal, often such an anomaly is inherited;
rapid metabolism - the body produces a lot of energy, which provokes an increase in temperature values;
heat, dry and hot air in the room - the temperature rises due to a violation of heat transfer, most often this condition occurs in a small child;
overheating, long flight;
stress, fear - adrenaline increases temperature values;
intense physical activity;
long-term fatigue - defensive reaction body, most people, when the temperature rises, try to observe bed rest at least a few days, which allows you to regain strength;
overeating, hangover syndrome;
in women, temperature indicators are affected by the phase menstrual cycle– an increase in values up to 37.1–37.3 can be observed before ovulation;
in young children, hyperthermia is observed during teething, after vaccinations, in adolescents - during hormonal changes body.

A prolonged increase in temperature to 37.1–37.4 after an acute respiratory viral infection or influenza is called a temperature tail or train - this condition is normal, harmless, and goes away on its own without additional treatment within 5–7 days. But if the problem after the illness does not disappear for the second week, it is possible that a secondary bacterial infection, you need to get tested.

Causes associated with diseases

Important! The temperature in the evening is usually a few tenths of a degree higher than in the morning or afternoon.

An increase in temperature over several weeks or months is a sign of an inflammatory process. The body constantly produces antibodies to fight pathogens.

A prolonged increase in temperature can be caused by caries, long-term non-healing ulcers in diabetics, allergies, and sexually transmitted diseases.

hormonal changes during pregnancy and breastfeeding– most often the values rise to 37.3–37.6 in the first trimester, after childbirth, the problem does not require drug therapy if the tests are normal;
ectopic pregnancy, ovarian cyst, disturbances in the functioning of female and male genital organs;
the presence of malignant tumors in the body - prolonged hyperthermia is often one of the first symptoms cancer, you need to urgently visit a doctor;
autoimmune diseases are disorders of the immune system in which the body attacks not only foreign cells, but its own cells;
diseases of the thyroid gland - its hormones take part in the process of thermoregulation, an increase in their number leads to a rapid heartbeat, weight loss, a person does not tolerate heat well, his hair condition worsens;
fluctuations in adrenal hormone levels;
anemia - a problem that often occurs in women and children with a lack of iron, internal bleeding, is characterized by a decrease in the level of hemoglobin in the blood.

Often an increase in temperature values is observed when long-term use antibiotics penicillin group, antipsychotics, antidepressants, muscle relaxants, antihistamines, narcotic painkillers, oral medications contraception.

Important! In infants up to 12 months, low-grade fever (up to 37.2 degrees) is considered normal; the indicators normalize by the beginning of the second year.

Since there are many reasons for prolonged low-grade fever, it is difficult to establish the real reason, you will have to visit many doctors, take various tests. Clinical analysis blood allows you to determine whether hyperthermia is caused by infectious or non-infectious pathologies. The presence of an inflammatory process indicates increase in ESR. An increased erythrocyte sedimentation rate in combination with a high content of monocytes, lymphocytes, and leukocytes indicates the presence of viral diseases. An increase in the number of eosinophils may indicate helminthic infestation, and leukocytosis with neutrophilia occurs with a bacterial infection.

To identify the cause of a prolonged increase in temperature, you must first visit a therapist or pediatrician. Based on examination, history taking, primary diagnosis he will give a referral to other specialists. An infectious disease specialist, an immunologist, an endocrinologist, a urologist, a gastroenterologist, and a phthisiatrician can treat low-grade fever. In some cases, consultation with a neurologist, psychotherapist, or oncologist may be required.

Important! Due to some anatomical, hormonal characteristics Normally, men's temperature is always slightly higher than women's.

With prolonged low-grade fever, self-medication is dangerous and useless, since it can distort clinical picture. Assign necessary medications Only a doctor can do this after identifying the causes of the temperature increase.

What you can do at home:

drink more fluid - pure water, herbal decoctions, fruit drinks, natural juices;
normalize your daily routine, get enough sleep;
avoid stress, use relaxing practices;
take vitamins, eat right, give up junk food and alcohol, reduce salt intake and caffeinated drinks;
strengthen the immune system - carry out hardening procedures, walk more fresh air, exercise.

At temperatures up to 38–38.5 degrees, you should not take antipyretics - the body, with the help of hyperthermia, tries to cope with the microbes on its own. Natural immunomodulators such as tincture of echinacea, eleutherococcus, and ginseng should also be used with caution. For many diseases, even such harmless remedies are contraindicated; you need to carefully read the instructions.

Long or constant increase temperatures above 37 degrees are a reason to consult a doctor, even if you generally feel good and have no symptoms of disease. Low-grade fever is often caused by non-dangerous reasons, but can sometimes be the first sign of serious, fatal diseases.

is a temperature at 37-37.5°C for a long time. In this case, a person may completely lack symptoms of any disease, or may experience malaise. We talk about low-grade fever not when isolated cases of increased temperature are recorded: this may be due to individual characteristics the body and the factors described above, and if low-grade fever is recorded in the temperature curve with measurements taken over many days in a row.

A true fever is considered to be a temperature above 38.3 degrees. This temperature is accompanied by very specific symptoms that correspond completely specific disease. But long-term low-grade fever is often the only sign; to find out the cause of which you will have to run to the doctors.

Normal temperature human body the recognized temperature is 36.6 °C, although for many normal temperature fixed at 37°C. This is the temperature observed at healthy body: child or adult, male or female - it doesn’t matter. This is not a stable static unchanging temperature; during the day it fluctuates in both directions depending on overheating, hypothermia, stress, time of day and biological rhythms. Therefore, temperature readings from 35.5 to 37.4 °C are considered the normal range.

Body temperature is regulated by endocrine glands - thyroid and hypothalamus. Receptors in the nerve cells of the hypothalamus respond to body temperature by changing the secretion of TSH, which regulates the activity of the thyroid gland. Thyroid hormones T3 and T4 regulate the intensity of metabolism, on which temperature depends. In women, the hormone estradiol is involved in temperature regulation. As its level increases, it decreases basal temperature- this process depends on the menstrual cycle. In women, body temperature changes by 0.3-0.5 °C during the menstrual cycle. The highest readings of up to 38 degrees are observed between days 15 and 25 of the standard menstrual cycle of 28 days.

Except hormonal levels Temperature readings are slightly affected by:

physical exercise;
eating;
in children: strong prolonged crying and active games;
time of day: in the morning the temperature is usually lower (the highest low temperature observed between 4-6 am), and reaches a maximum in the evening (from 18 to 24 am - the period of maximum temperature);
Old people's temperature drops.

Physiological fluctuations in thermometry during the day within the range of 0.5-1 degrees are considered normal.

Low-grade fever does not apply to normal state body and therefore the main question that is posed to the doctor is to identify the causes of the pathology. If the patient has recently been ill and has been treated for a long time, it is believed that the increase in temperature is associated with the healing process. If there was nothing like that, then you have to look for the dysfunction that caused this symptom. To more accurately identify pathology, it is recommended to draw up a temperature curve, analyze your state of health, and perform laboratory diagnostics.

Diseases characterized by low-grade fever

Infectious causes of diseases

Infections are the most common reason low-grade fever. With the long-term existence of the disease, the symptoms usually disappear and only a low-grade fever remains. The main causes of infectious low-grade fever are:

ENT diseases - sinusitis, tonsillitis, otitis media, pharyngitis, etc.
Dental diseases and carious teeth including.
Gastrointestinal diseases - gastritis, pancreatitis, colitis, cholecystitis, etc.
Diseases urinary tract- pyelonephritis, cystitis, urethritis, etc.
Diseases of the genital organs - inflammation of the appendages and prostatitis.
Abscesses from injections.
Non-healing ulcers of patients with diabetes mellitus.

Autoimmune diseases

In autoimmune diseases, the body's immune system begins to attack its own cells, which causes chronic inflammation with periods of exacerbation. For this reason, body temperature also changes. The most common autoimmune pathologies:

rheumatoid arthritis;
systemic lupus erythematosus;
Hashimoto's thyroiditis;
Crohn's disease;
diffuse toxic goiter.

To identify autoimmune diseases ESR tests are prescribed, C-reactive protein, rheumatoid factor and some other examinations.

Oncological diseases

At malignant tumors low-grade fever may be early manifestation disease, 6 to 8 months ahead of its symptoms. The formation of immune complexes that trigger immune reaction. However early promotion temperatures are associated with the onset of tumor tissue production of a specific protein. This protein is found in blood, urine and tumor tissue. If the tumor has not yet manifested itself, diagnostic value has a combination of low-grade fever with specific changes in the blood. Low-grade fever often accompanies chronic myeloid leukemia, lymphocytic leukemia, lymphoma, and lymphosarcoma.

Other diseases

Other diseases can cause low-grade fever:

autonomic dysfunction: disruption of the heart and cardiovascular system;
dysfunction endocrine glands: hyperthyroidism and thyrotoxicosis (detected by ultrasound of the thyroid gland and a blood test for hormones T3, T4, TSH, antibodies to TSH);
hormonal disorders;
hidden infection: Epstein-Barr virus, cytomegalovirus infection, herpetic infection;
HIV infection (detected by ELISA and PCR);
helminthiasis (detected by stool analysis for worm eggs);
toxoplasmosis (detected by ELISA);
brucellosis (detected by PCR);
tuberculosis (detected by Mantoux tests and fluorography);
hepatitis (detected by ELISA and PCR);
Iron-deficiency anemia;
allergic reactions;
thermoneurosis.

Infectious low-grade fever is characterized by:

reduction in temperature under the influence of an antipyretic;
poor temperature tolerance;
daily physiological temperature fluctuations.

Non-infectious low-grade fever is characterized by:

unnoticed leakage;
lack of response to antipyretics;
no daily changes.

Safe low-grade fever

Low-grade fever is completely safe during pregnancy, menopause and breastfeeding, which is simply a symptom of hormonal changes.
A fever tail may persist for up to two months or even six months after infectious diseases.
Neurosis and stress may well cause the temperature to rise in the evenings. In this case, low-grade fever will be accompanied by a feeling chronic fatigue and general weakness.

Psychogenic low-grade fever

Low-grade fever, like any other processes in the body, is influenced by the psyche. During stress and neuroses, the first thing that is disrupted is metabolic processes. Therefore, women often experience unmotivated low-grade fever. Stress and neuroses provoke a rise in temperature, and excessive suggestibility (for example, about a disease) can influence the actual rise in temperature. In young women of the asthenic type, prone to frequent headaches and VSD, hyperthermia is accompanied by insomnia, weakness, shortness of breath, chest and abdominal pain.

To diagnose the condition, tests are prescribed to assess psychological stability:

tests to detect panic attacks;
depression and anxiety scale;
Beck scale;
scale of emotional excitability,
Toronto Alexithymic Scale.

Based on the results of the tests, the patient is given a referral to a psychotherapist.

Drug-induced low-grade fever

Long-term use of some medicines can also cause low-grade fever: adrenaline, ephedrine, atropine, antidepressants, antihistamines, neuroleptics, some antibiotics (ampicillin, penicillin, isoniazid, lincomycin), chemotherapy, narcotic painkillers, thyroxine preparations. Canceling therapy also relieves obsessive low-grade fever.

Low-grade fever in children

Of course, any parent will begin to worry if his child has a fever every day in the evening. And this is correct, because in children, an increase in temperature in some cases is the only symptom of the disease. The norm for low-grade fever in children is:

age up to one year (reaction to BCG vaccine or unsteady thermoregulation processes);
the period of teething, when elevated temperature can be observed for several months;
in children from 8 to 14 years old, due to critical phases of growth.

Long-term low-grade fever, which occurs due to a violation of thermoregulation, is said if the child’s temperature is 37.0–38.0°C for more than 2 weeks, and the child:

does not lose weight;
examination shows the absence of diseases;
all tests are normal;
pulse rate is normal;
Antibiotics do not reduce fever;
Antipyretics do not reduce the temperature.

Often in children, fever is caused by endocrine system. It quite often happens that in children with fever, the functionality of the adrenal cortex is impaired, and the immune system is weakened. If you draw psychological picture children with fever for no reason, you get a portrait of an uncommunicative, suspicious, withdrawn, easily irritated child, whom any event can unsettle.

Treatment and correct image life bring children's heat exchange back to normal. As a rule, after 15 years, few people experience this temperature. Parents should organize correct mode day for the child. Children suffering from low-grade fever should get enough sleep, walk and sit at the computer less often. Hardening trains thermoregulatory mechanisms well.

In older children, low-grade fever accompanies such frequent illnesses, such as adenoiditis, helminthiasis, allergic reactions. But low-grade fever may indicate development and more dangerous diseases: cancer, tuberculosis, asthma, blood diseases.

Therefore, you should definitely consult a doctor if your child has a temperature of 37-38 °C for more than three weeks. To diagnose and clarify the causes of low-grade fever, the following studies will be prescribed:

If abnormalities are detected in the tests, this will be a reason to refer specialists for consultation.

How to measure temperature in children correctly

Children should not measure their temperature immediately after waking up, after lunch, after vigorous physical activity, or in an excited state. During this time the temperature may rise physiological reasons. If the child is sleeping, resting, or hungry, the temperature may drop.

When measuring temperature, you need to wipe armpit dry and hold the thermometer for at least 10 minutes. Change thermometers periodically.

How to deal with low-grade fever

First, you should diagnose a low-grade fever, because not every increase in temperature in the specified range is a low-grade fever. The conclusion about low-grade fever is made based on the analysis of the temperature curve, which is compiled using data from temperature measurements 2 times a day at the same time - in the morning and in the evening. The measurements are carried out over three weeks, the measurement results are analyzed by the attending physician.

If a doctor diagnoses low-grade fever, the patient will have to visit the following specialists:

Tests that will need to be taken to identify hidden current diseases:

UAC and OAM;
blood biochemistry;
cumulative urine samples and 24-hour urine testing;
feces on worm eggs;
blood for HIV;
blood for hepatitis B and C;
blood on RW;
radiography of the sinuses;
X-ray of the lungs;
otolaryngoscopy;
tuberculin tests;
blood for hormones;
Ultrasound of internal organs.

Identification of deviations in any analysis becomes a reason for prescribing a more in-depth examination.

Prevention measures

If no pathology is detected in the body, you should pay close attention to the health of your body. To gradually bring thermoregulatory processes back to normal, you need to:

promptly treat all foci of infection and emerging diseases;
avoid stress;
minimize the number of bad habits;
maintain a daily routine;
get enough sleep according to your body’s needs;
exercise regularly;
harden;
walk more in the fresh air.

All these methods help strengthen the immune system and train heat transfer processes.