Low fever during the day and fever at night for more than a year, generally consider that it may be caused by weakness, tuberculosis and tumor fever, etc. It is recommended that patients need further examination to clarify the diagnosis. 1. Tuberculosis: low fever is one of the more obvious characteristics of tuberculosis, generally 2 to 3 days after the afternoon fever, most patients at 12 o’clock at night body temperature will return to normal. The specific characteristics of fever, there are some individual differences, and it has something to do with the individual’s physical condition. 2. Tumor fever: Tumor fever usually appears in the late stage of malignant tumors, usually around 2:00 p.m. fever, usually low-grade fever, and the fever will gradually subside at night. Therefore, it is suggested that patients should go to regular hospitals as early as possible for further examination and treatment under the guidance of specialists after clear diagnosis.