Low fever is also called hypothermia, the most commonly used in clinical practice is generally the axillary temperature, the normal axillary temperature is generally between 36.2 ` to 37.2 ℃, body temperature between 37.3 to 38 ℃ belongs to low fever. The causes of low fever include physiologic, pathologic and drug factors. 1. Physiological low fever is most common in women who are overstressed, after strenuous exercise, before and after the female physiological period, and in early pregnancy. 2. Pathological low fever is divided into two categories: infectious diseases and non-infectious diseases. Infectious diseases mainly include bacterial colds, viral colds, tuberculosis, various types of viral hepatitis, syphilis, etc. Non-infectious diseases are divided into hyperthyroidism, rheumatic fever, leukemia, autonomic dysfunction, bone fracture, heatstroke, hemorrhage and other conditions. 3. Drug factors low fever is generally seen in the use of atropine, antidepressants and antihistamines. If the patient has repeated symptoms of low fever, it is necessary to find the cause and then target treatment. If the patient has a prolonged low fever does not go away, you need to go to the offline hospital in time to find the cause of the symptomatic treatment.