Around three o’clock in the afternoon cold fever, the more common cause is infectious diseases such as respiratory tract infections, urinary tract infections, etc., in addition to infectious diseases, non-infectious diseases can also occur chills and fever phenomenon, such as connective tissue diseases and so on. 1. Respiratory tract infections: such as pneumonia, tuberculosis, there can be chills, fever performance, some patients may also have chills; 3. urinary tract infections: such as urinary tract infections or pyelonephritis, can have chills, chills, fever; 3. connective tissue diseases: usually with rheumatoid arthritis, rheumatoid arthritis, dermatomyositis and other factors, there can be low fever, chills. The causes of chills and fever at 3 p.m. are very complex and need to be combined with the patient’s accompanying symptoms. It is recommended that the patient actively consult the doctor, improve the relevant examinations, and clarify the specific causes of the disease, so as to systematically treat the disease.