Chest tightness and stomach gas can be caused by a variety of reasons, mainly due to gastrointestinal flatulence, common causes include stress factors, indigestion, weak gastrointestinal dynamics, excessive intake of foods that cause flatulence, functional gastrointestinal disorders such as constipation-type irritable bowel syndrome, as well as organic diseases such as gastrointestinal tumors and so on. 1. Psychological factors: stressful life, emotional tension and depression, etc., can cause indigestion, chest tightness and flatulence. 2. Indigestion: some patients have poor physical condition, which is characterized by insufficient gastrointestinal power, and a little intake of hard-to-digest food or food that is irritating to the gastrointestinal tract can cause indigestion, which is manifested as tightness in the chest and flatulence in the stomach. 3. Excessive intake of flatulence food: If you intake too much beans and other easy to cause flatulence food, can also cause chest tightness and stomach gas. 4. Functional diseases of the gastrointestinal tract: such as dyspepsia, irritable bowel syndrome constipation type, neurosis and so on. 5. Organic diseases: such as gastrointestinal tumors, chronic gastritis, gastric ulcer, gastric ptosis, gastric dilatation and pyloric obstruction, etc., which can be manifested as abdominal distension, chest tightness, accompanied by belching, bowel sounds and other symptoms. Chest tightness and stomach gas can also be seen in other causes, it is recommended to rule out stress, indigestion and improper diet and other physiological causes, and then go to the hospital in time to avoid delaying the condition.