Small abdominal distension two years after colon cancer surgery may be caused by intestinal adhesion, digestive insufficiency and tumor recurrence. 1. Intestinal adhesion: Intestinal adhesion is a common complication after colon cancer surgery, which can cause complete and incomplete intestinal obstruction, leading to constipation and abdominal distension. Therefore, if the patient has small abdominal distension two years after colon cancer surgery, the first thing to consider is whether the patient has postoperative intestinal adhesion. 2. Digestive insufficiency: If patients do not pay attention to diet after colon cancer surgery, and eat sweets, high protein and other foods that are easy to produce gas excessively, small abdominal distension two years after colon cancer surgery may occur. Patients should change their diet, eat more easy-to-digest food and take oral medicines to promote gastrointestinal power such as Mosapride as prescribed by doctor, which usually can relieve small abdominal distension. 3. Tumor recurrence: if small abdominal distension occurs two years after colon cancer surgery, patients should improve abdominal CT examination. If colon cancer recurs, patients will not only have small abdominal distension, but also show symptoms such as increased frequency of bowel movement, nausea and vomiting, fatigue, fever and blood in stool. When patients have symptoms of abdominal distension two years after colon cancer surgery, they should go to the hospital in time and have reasonable treatment under the doctor’s guidance, so as to avoid delaying the condition and causing adverse consequences.