Whether acute gastroenteritis is contagious or not depends on the cause of the disease. It is usually not contagious when it is caused by eating cold and raw foods, while it is contagious when it is caused by viral or bacterial infection, as follows. 1. Non-contagious: most acute gastroenteritis is related to improper diet, such as excessive consumption of spicy and cold food caused by intestinal discomfort, such cases are generally not contagious, usually not contagious. 2. Contagious: If acute gastroenteritis is caused by viruses (e.g. rotavirus, norovirus), or bacteria (e.g. Escherichia coli, etc.), it can also be transmitted through water, food, or patients’ vomit and excreta, so it is contagious; in addition, we should not ignore the acute gastroenteritis caused by Helicobacter pylori, which can be transmitted through the digestive tract as well. Acute gastroenteritis is mainly symptomatic treatment, can be given to regulate intestinal flora, antispasmodic, gastric drugs, if necessary, give antidiarrheal treatment, medication should be in accordance with medical advice. It is recommended that patients seek timely medical treatment.