There is a possibility of small stomach pain in colon cancer, which is mainly based on the location where the colon tumor occurs. Because colon is relatively long and widely distributed in human abdominal cavity, from lower right abdomen to upper right abdomen, upper abdomen, left upper abdomen, left side abdomen, and lower left abdomen including pelvis have colon presence, of course, tumors occurring in different parts of the body, the location of pain is also different. If the tumor occurs in the sigmoid colon, the patient may have pain in the lower abdomen, because the sigmoid colon is mainly in the left lower abdomen as well as the lower abdomen, and when the tumor occurs, the main manifestation of the tumor is pain in the left lower abdomen or the lower abdomen. If the tumor appears in the ascending colon, the patient may have pain in the right lower abdomen or in the right side of the abdomen. Therefore, once patients have abdominal pain, they should go to the hospital for examination in time, which can be combined with physical examination, and then with colonoscopy or abdominal CT examination to make a clear diagnosis.