Ingestion of irritating foods, damage to the gastric mucosa, excessive secretion of gastric acid, and diseases in the gallbladder and pancreas can all cause stomach pain. The main role of the stomach is to hold and digest food, but there are many factors that can affect the stomach lining in some way and therefore induce a painful sensation in the stomach. The intake of irritating foods in the diet, such as chili peppers, leeks, cold drinks, hormonal drugs, etc., can cause a painful feeling in the stomach because of the irritation caused by the food, as well as the drugs, to the gastric mucosa. In the stomach wall there is a layer of mucous membrane, not only can secrete digestive juices, but also have the role of protecting the stomach wall. Once the gastric mucosa is damaged, such as inflammation, edema, congestion, and ulcers, inflammatory factors are released, causing irritation to the stomach wall and thus causing a painful feeling in the stomach. When too much acid is secreted, it tends to corrode the gastric mucosa, so stomach pain can also occur. The gallbladder and pancreas have the function of secreting digestive juices, and once they are diseased, the digestion of food will be affected, and the stomach will also be involved in pain.