Colorectal cancer pain is generally not always painful, colon cancer refers to the appearance of tumors and masses in the colon, early tumors are usually painless when they are relatively small, when the tumors continue to progress, there may be gradual appearance of pain. When the tumor continues to progress, the pain may appear gradually. Generally, the pain is relatively light in nature and may be relieved by itself after a period of time, which can be tolerated by most of the patients or some of the patients do not pay attention to it, so they do not go to the hospital for checkup in time. When the tumor continues to grow and may invade beyond the intestinal wall and some organs in the abdominal and pelvic cavity, the pain may increase, and the symptoms of intestinal obstruction may appear, which may manifest as paroxysmal abdominal pain, that is, the pain will increase significantly for a period of time, but the pain may disappear on its own after a period of time.