Fever after exercise overload usually has several factors: 1. Infectious factors in exercise overload, the body’s immunity will be relatively weakened, at this time is particularly easy to sweat after the invasion of cold and wind evil infected bacteria or viruses, this will be due to bacteria and viruses invade the body and lead to the initial fever of the cold. 2. In the human body exercise overload and exercise way method is not correct, will appear the symptoms of rhabdomyolysis, this symptom will The symptoms of rhabdomyolysis are the accumulation of excessive lactic acid and creatine kinase in the body, along with fever, dizziness, head swelling, and darkening of urine. 3, when exercising outdoors too much in summer, the symptoms of heat stroke, heat cramps and pyrexia can occur, which can also lead to fever.