If you have a chronic gastritis problem, eating certain foods that are not easy to digest or cold, irritating foods, resulting in gastric mucosa congestion, edema and inflammatory reaction, which leads to some neurological malfunction, will stimulate the abnormal peristalsis of the gastrointestinal tract. This causes spasm of the diaphragm, and then there will be gas moving upward. This may be due to indigestion, because the food is not easily digested after eating, or the food stays in the stomach for too long, too much gastric juice secretion may lead to abnormal secretion of gastric acid, and at the same time will stimulate the secretion of too much pepsin, when absorbing and digesting the food eaten, too much gas will lead to acid reflux and diaphragm spasm. It is also possible that because of hepatitis disease, abdominal distension and nausea will occur after the abnormal liver function, which will further lead to gas upward.