The presence of body aches and weakness and body chills is likely to be a symptom of fever, and the body temperature needs to be measured quickly, for example, by using a mercury thermometer in the armpit. If the body temperature is high, more than 37 degrees, it often indicates that the fever is caused by body aches and weakness and body chills. The body’s heat production increases and heat dissipation decreases. In order to reduce heat dissipation, the blood vessels on the surface of the skin contract and the temperature of the skin surface decreases, resulting in chills. In addition, due to the stimulation of toxins, body aches and weakness may occur. In addition, the fever will cause an increase in metabolic rate and anaerobic glycolysis, which will also lead to body aches and weakness. Fever reduction treatment is needed quickly, especially if the body temperature is greater than 38.5 degrees, and oral ibuprofen suspension is recommended.