The distention in the middle of the upper abdomen may be caused by gastritis, coronary heart disease, cholecystitis and other diseases. 1. gastritis: inflammation of the stomach will affect the body’s digestive function, resulting in slowing down of gastrointestinal peristalsis, which will cause flatulence and a feeling of stuffiness and bloating in the middle of the epigastric region. 2. coronary heart disease: coronary heart disease is mainly caused by the heart contraction, diastolic dysfunction, will lead to blood stagnation in the pulmonary circulation. As a result, there is a feeling of congestion and swelling in the middle of the upper abdomen. 3. cholecystitis: gallbladder by inflammation stimulation will appear exudate, will affect the gastrointestinal peristalsis, flatulence, will lead to the middle of the epigastric stuffy bloating. The distention in the middle of the upper abdomen may also be seen in other diseases such as peptic ulcer, if the symptoms of distention in the middle of the upper abdomen, persistent and unrelieved, you need to consult a doctor for treatment.