Fever every afternoon and evening may be related to autonomic dysfunction, viral cold, tuberculosis and other diseases. 1. Autonomic dysfunction: Autonomic dysfunction can cause dysregulation of body temperature, so that heat production is greater than heat dissipation, which can last for months or even years, and is usually a low-grade fever. This leads to fever every afternoon and evening. 2. Viral colds: the body’s immunity is weaker in the afternoon and evening, when suffering from viral colds, the virus will reproduce in large quantities, thus inducing an increase in body temperature, leading to fever every afternoon and evening. 3. Tuberculosis: the human body is infected with Mycobacterium tuberculosis and leads to tuberculosis, the secretion of glucocorticoids will increase in the afternoon, and Mycobacterium tuberculosis will be more active, which leads to fever every afternoon and evening. It is recommended that patients with fever in the afternoon and evening go to the hospital in time to see a doctor to clarify the cause of the disease, and then standardize the treatment under the guidance of the doctor.