Chest tightness and abdominal distension may be caused by overeating, heart failure or stomach cancer. 1. Eating too much: when patients eat too much at one time or overeat, it is very likely to cause the food to press on the abdomen, causing chest tightness and abdominal distension. 2. Heart failure: when suffering from high blood pressure or coronary heart disease, etc., it may affect the blood supply to the heart and lead to heart failure. After suffering from this disease, it will affect the normal circulation of blood, which is not conducive to the normal digestion of food and breathing, and then it can also cause the symptom of chest tightness and abdominal distension. 3. Stomach cancer: affected by bad living habits and radiation and other factors, it may cause stomach cancer. The disease may metastasize and affect the organs and tissues in chest, which may also induce the symptom of chest tightness and abdominal distension. Chest tightness and abdominal distension may also be caused by other reasons, patients should go to the hospital in time to consult the doctor and carry out targeted treatment after clarifying the cause of the disease.