Low-grade fever: what is it, why does it occur

Low-grade fever © depositphotos.com

Body temperature is an important physiological parameter that indicates the state of the body. Normal human body temperature is 36.6 ° C. Perhaps the average daily fluctuation in the range of 35.5-37.2 ° C. The lowest value is usually fixed in the morning, and the maximum in the evening. Sometimes the temperature rises to 38 ° C for no apparent reason. Such an increase is called subfebrile temperature. Often it disappears as unexpectedly as it appears, but after a certain period returns.

tochka.net will tell you how to recognize subfebrile temperature, what are the reasons for its occurrence and what to do if the thermometer’s arrow “jumps” up and down.

What is subfebrile temperature, subfebrile condition

Body temperature up to 38 ° C, which is not a consequence of the common cold or other diseases, is called subfebrile. It can return to normal throughout the day: rise or disappear in the late afternoon, depending on biorhythms, physical activity, hormonal levels, emotional state.

A stable increase in temperature that persists for several days is a kind of “bell” that notifies us that the immune system has malfunctioned and that the body has an inflammatory process or an infection or virus.

A prolonged increase in subfebrile temperature is called – subfebrile condition of unknown etiology. This condition can last several months. The presence of subfebrile condition indicates a sluggish inflammatory process in various organs and systems, more often in the genitourinary and bronchopulmonary. By the way, in the context of the coronavirus pandemic, it is known that prolonged subfebrile condition is a sign of the patient having COVID-19.

Normally, subfebrile condition can occur in women during menstruation, menopause, in pregnant women, as well as in athletes who are intensely preparing for competitions.

Subfebrile condition persists with nervous strain, prolonged stress. It is estimated that in 70 – 80% of cases, protracted subfebrile condition occurs in young women with signs of asthenia, in those who suffer from increased fatigue, weakness, irritability, nervousness, sleep disturbances and other psychopathological disorders.

Causes of low-grade fever in adults and children

It is quite difficult to identify the causes of subfebrile temperature, and the search process can take several weeks. It is necessary to diagnose the whole organism.

Among the main causes of low-grade fever in adults are:

anemia the presence of intestinal parasites, intestinal infection; tuberculosis; HIV infection and AIDS; toxoplasmosis; vegetovascular dystonia; sepsis; thyroid disease; diseases of the genitourinary system; respiratory diseases (tonsillitis, bronchitis, pneumonia); some diseases of the gastrointestinal tract (gastritis, colitis); autoimmune diseases (lupus erythematosus, rheumatoid arthritis, Crohn's disease); hormonal changes (pregnancy, menstruation, menopause, ovulation, lactation); oncological diseases; hepatitis B and C; mononucleosis; allergies drug therapy.

Low-grade fever Low-grade fever © depositphotos.com

Subfebrile temperature in children and adolescents can occur for other reasons, observed during the period of active growth from 8 to 14 years. In infants up to a year, subfebrile condition is also associated with vaccination. Often subfebrile condition is fixed with adenoiditis, problems with teeth, infections in the nasopharynx, and inflammation of the tonsils. Sometimes there are congenital pathologies that cause fever.

Very often, low-grade fever is the result of a child’s illness, a virus. Therefore, a “temperature tail” (up to 37.2 ° C) is a normal phenomenon for several days and even weeks after SARS. An increase in temperature in children is accompanied mainly by lethargy.

Subfebrile temperature examinations

You can not let the situation drift and wait until the low-grade fever disappears by itself. It is necessary to look for the causes of its occurrence and take up treatment. The only way out is to seek help from a family doctor who will prescribe biochemical tests and hardware diagnostics of the body. The therapist can advise you to contact narrow specialists – an endocrinologist, an infectious disease specialist, a surgeon, a neuropathologist, an otolaryngologist, a cardiologist, etc.

If subfebrile condition is detected, biochemical studies are indicated, namely: a general blood test, a blood test for sugar, a general urinalysis, and tests for thyroid hormones. It is also necessary to do fluorography, ultrasound of the thyroid gland and internal organs, ECG, tests for genital infections, it is recommended to undergo examination by a dentist.

To understand whether subfebrile condition is associated with infection, you can do an aspirin test. It is necessary to take an antipyretic and, if the reaction to it is positive, then the cause of subfebrile condition is infection. When the temperature does not drop, then the reason is different, and it must be identified.

Earlier we talked about how to treat worms in adults at home.


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Angelo L. Lyons

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