The stomach pain and nausea diarrhea are commonly caused by acute gastroenteritis and gastrointestinal flu, which require timely consultation with gastroenterology to clarify the cause and treat the symptoms. 1, acute gastroenteritis: often due to eating unclean food, abdominal cold, or bacterial infection caused by acute gastrointestinal inflammation, manifested as epigastric or periumbilical discomfort, hidden pain, paroxysmal pain, nausea and vomiting, diarrhea and other symptoms. Treatment should pay attention to dietary hygiene and eat an easily digestible liquid diet, such as light noodles and millet porridge. Avoid overeating, do not eat spicy and stimulating, raw and cold, greasy food, and eat more fresh vegetables and fruits, which can supplement multivitamins. In addition, pay attention to replenishing water and electrolytes. Those whose vomiting has been relieved or whose symptoms are mild should drink more water and can add a little salt for rehydration, while those with more severe symptoms need to fast and rehydrate intravenously. Those with severe abdominal pain can be treated with antispasmodic drugs, such as scopolamine hydrochloride, which can usually relieve the symptoms of diarrhea and vomiting after pain relief. Treatment with antibacterial drugs, such as clindamycin, is applied when necessary. If the gastroenteritis is caused by inappropriate use of antibacterial drugs, antibacterial drugs should be discontinued; 2. Gastrointestinal colds: infections caused by bacteria or viruses, which can manifest as stomach distension, abdominal pain, vomiting, diarrhea, etc. Treatment is based on rest and avoiding crowded places to avoid cross-infection. Drink more warm water, eat easy-to-digest, light food, and eat fresh vegetables and fruits appropriately. If the diarrhea is severe, anti-diarrhea and rehydration should be given, and intestinal flora can also be regulated with intestinal probiotics, such as lactobacillus tablets, as prescribed by the doctor. If vomiting is present, anti-emetic and rehydration treatment can be given.