Stomach pain and diarrhea, accompanied by nausea and vomiting, have various causes: 1. They are considered to be caused by gastric ulcers or stomach tumors. In any case, it is necessary to actively undergo an examination when such symptoms appear. 2, it may be caused by acute gastroenteritis, which is an acute inflammation caused by infection with bacteria or viruses, and the patient may experience significant nausea, vomiting, or stomach pain, also accompanied by diarrhea, so this symptom should actively undergo a gastroscopy when it appears. 3. If the daily diet is not correct, the intake of raw and cold food, the intake of irritating food, is likely to lead to diarrhea, stomach pain, vomiting symptoms, so even into the hot summer, in the daily diet should not be greedy for cold, choose light food is correct.