Fever muscle aches and pains may be caused by the inflammatory response itself, or by metabolic disorders in the body. 1. Inflammatory response: As the body is invaded by pathogenic bacteria such as bacteria and viruses, it reacts with the autoimmune system and releases mediators such as prostaglandins and leukotrienes, while at the same time the permeability of the blood vessel wall increases and stimulates the peripheral nerve roots, leading to the symptoms of muscle aches and pains. 2. Organism metabolic disorders: fever due to the rise in body temperature, the body’s basal metabolic rate will increase, muscle tissue appears temporary ischemia, hypoxia, thus from aerobic metabolism to anaerobic metabolism, anaerobic metabolism will produce more lactic acid, will also cause symptoms of muscle pain. If the symptoms of fever and muscle pain are not relieved, or accompanied by other symptoms, the patient should go to the hospital in a timely manner, to clarify the cause and give targeted treatment.