The swelling under the chest may be caused by chronic gastritis, gastric ulcer, coronary heart disease, etc. Patients should seek medical treatment in time to clarify the cause of the disease. 1. Chronic gastritis: a variety of causes of chronic inflammatory changes in the gastric mucosa, the patient will have epigastric pain, swelling under the chest, acid reflux, nausea, anemia and other symptoms, you can use omeprazole and other drugs for treatment. 2. Gastric ulcer: when the gastric mucosa is damaged for some reasons, ulcer occurs on the inner wall of the stomach, and the patient will have abdominal pain, distension under the chest, feeling of fullness and other symptoms, which can be treated with drugs such as omeprazole and famotidine. 3. Coronary heart disease: middle-aged and elderly people who have swelling under the chest may be caused by coronary artery atherosclerosis resulting in insufficient blood supply to the heart, such people will also have a sense of pressure in the chest, dyspnea and other symptoms, should be treated with drugs such as nitroglycerin. All of the above drugs should be used under the guidance of a doctor.