After active treatment of fever caused by gastroenteritis, the body temperature can generally return to normal level in 1-2 days. Fever caused by gastroenteritis is mainly seen in acute gastroenteritis, which is caused by a large number of pathogenic bacteria entering the gastrointestinal tract caused by unclean diet, stimulating the mucosa of the gastrointestinal tract resulting in damage to the mucosa, and the toxins produced by the bacteria entering the blood circulation through the broken mucosa, resulting in systemic toxic symptoms. The patient’s body temperature is usually below 38℃, but severe cases may also develop high fever, with body temperature up to 40℃ or more. After anti-infective treatment is given and the bacteria and bacterial toxins in the circulation are inhibited or killed and metabolized out of the body, the patient’s body temperature will gradually return to normal in 1-2 days, or 5-7 days in severe cases. If patients with acute gastroenteritis have electrolyte disorders and acid-base imbalance, they will have central fever, and their body temperature will randomly return to normal after actively correcting the electrolyte disorders and acid-base balance, usually in 1-2 days. It is recommended that patients with acute gastroenteritis should increase water intake appropriately to avoid water-electrolyte disturbances, and the diet should be light to avoid food irritation of the gastrointestinal tract and aggravation of the disease. If fever, unconsciousness and other symptoms of systemic toxicity appear, prompt medical attention should be sought.