Stomach pain, bloating and diarrhea are the result of indigestion, acute gastroenteritis and irritable bowel syndrome. Indigestion is related to a variety of factors, such as eating indigestible food and insufficient gastrointestinal power. People with indigestion will have a bloated feeling in the stomach after eating and drinking because the food cannot be digested and emptied in time, so it will remain in the stomach. After the food stays in the stomach for a long time, it even rots and erodes, causing irritation to the stomach and causing pain in the stomach. When the rotten food enters the intestine, it can also cause damage to the intestine and cause diarrhea. Acute gastroenteritis is associated with bacterial infection, cold in the abdomen, and cold in the abdomen. During acute gastroenteritis, there is congestion and edema in the mucous membrane of the digestive system, which leads to spasmodic contraction of the smooth muscles of the stomach and intestines and induces symptoms such as stomach distension, stomach pain and diarrhea. Some people may suffer from emotional disturbance of the plant nervous system, which may lead to irritable bowel syndrome attacks. During an irritable bowel syndrome attack, the peristaltic function of the stomach and intestines will be disturbed, causing symptoms of the digestive system, such as gastric distension, stomach pain, diarrhea, etc.