Always low fever 37.5 need to clarify the cause of the disease, according to the cause of targeted treatment. The most common causes of low fever 37.5 ℃ are tuberculosis, respiratory tract infection. Treatment should be anti-tuberculosis and anti-infection treatment. 1. Respiratory tract infections caused by low fever, if the bacterial infection, but also accompanied by routine blood white blood cell elevation, need to use antibiotics for treatment, such as penicillin antibiotic amoxicillin, or cephalosporin antibiotic cefadroxil, cefadroxil hydroxyl aminobenzene. 2. Patients with pulmonary tuberculosis will show low fever in the afternoon, and will be treated with anti-tuberculosis therapy, such as isoniazid, rifampicin and pyrazinamide. It is recommended that patients first go to a regular hospital for examination and treatment, to clarify the cause of the disease, according to the doctor’s guidance to choose the appropriate treatment.