Emphysema causes abdominal distension, which is related to abnormal lung function, long-term hypoxia, and later complications. 1. Abnormalities of the lungs: emphysema patients generally have abnormal respiratory function, the gas in the lungs can not be discharged, and the lungs will increase in size, which will have a compressive effect on the heart and the stomach, the organs near the lungs, which will easily lead to abnormalities of the gastrointestinal tract, and will affect the digestive function of the stomach and intestine and lead to abdominal distension. 2. Prolonged hypoxia: emphysema can lead to hypoxia, which makes the stomach congested and edematous, affecting the digestive function of the stomach, and patients with emphysema should not exercise due to respiratory distress during an attack, and insufficient exercise will also affect the peristalsis of the intestines, causing abdominal distension. 3. Late complications: the long-term development of emphysema will lead to right heart insufficiency, leading to pulmonary heart disease, heart failure and other complications, which will easily lead to gastrointestinal bruising, swelling, abdominal distension. In addition, wearing non-invasive ventilator for a long time and side effects of some drugs may also affect the digestive function and trigger abdominal distension. When emphysema patients develop other symptoms, they should actively search for the cause of the disease and follow the doctor’s instructions for standardized treatment to avoid serious consequences.