The symptoms of diarrhea after fever reduction are mostly related to the following reasons: 1. drug stimulation, because antipyretic drugs not only play an inhibitory regulatory role on the patient’s thermoregulatory center, but also cause stimulation to the mucous membrane tissue of the human digestive tract. When the surface mucosa of the digestive organs such as the stomach and intestines becomes impaired in digestion and absorption, a large amount of water and nutrients will be excreted from the body in the form of excrement. 2. Inflammation spreads, when inflammatory diseases occur in the local organs and tissues of patients, pathogenic bacteria will spread through the human circulatory system. When the digestive system is infected with pathogenic bacteria, it will be accompanied by diarrhea, diarrhea, loose stools and other undesirable symptoms. Because this type of digestive tract infection is a co-infection, the symptoms may be delayed. However, it cannot be excluded that other types of diseases cause such symptoms, such as chronic gastroenteritis, irritable bowel syndrome, rectal polyps, etc.