The causes of abdominal distension in patients with colon cancer after surgery are as follows: 1. For early patients after surgery, patients often complain of abdominal distension within four weeks after surgery. This is because the patient’s intestinal function is in the recovery period and the intestinal order is being established, so it is normal to have abdominal distension or spasmodic abdominal pain during this period; 2. Chronic abdominal pain or abdominal distension after surgery is related to diet for most people. After surgery, it is recommended to try to eat food that is easy to digest and does not produce a lot of gas as the main food. Avoid eating rice cakes that are not easy to digest or radish water that produces especially much gas as well as drinks such as soy milk, which are not advocated to eat more.