Fever in the evening is commonly caused by physiological reasons, such as high room temperature, and pathologic reasons, such as infectious diseases, respiratory infections, tuberculosis and so on. 1. Physiological causes: Fever is related to the individual’s physical condition and high ambient temperature, which need to improve the body’s immunity and regulate the room temperature so that the symptoms can be improved. 2. Pathological causes: most common in infectious diseases, such as bacterial and viral infections, common respiratory infections, in addition to fever, often accompanied by coughing, coughing up sputum, etc.; Tuberculosis, most of the fever in the evening, mostly accompanied by fatigue, night sweats (sweating abnormally after going to sleep, waking up sweating stops), emaciation, etc., when you need to go to the hospital, to clarify the cause of the disease. Fever by night, if persistent high fever, it is recommended to go to the hospital in time.