Colon cancer is more common in the right half of the colon, followed by the sigmoid colon and the rectum, with the transverse colon and the descending colon being relatively less common. However, in general, it can occur in all parts of the colon, only the frequency is higher or lower. Symptoms: Firstly, it is in the right half of the colon, in the right lower abdomen, followed by the sigmoid colon and the descending colon. The clinical manifestations of these two sites are different. The common symptom of the tumor of right half colon is mainly abdominal pain, often feel the right side of the abdomen, right lower abdomen pain. Secondly, sometimes patients can feel the mass by themselves. Third, it is anemia, which is more common. As the tumor is relatively large and may be found late, often repeated ulceration or tumor consumption, patients often have anemia symptoms. Sometimes patients go to the internal medicine department because of anemia, and after checking and checking, they finally find that there is a space-occupying lesion in the right lower abdomen through imaging examination or CT scan. For people with severe anemia or recurrent anemia, it may also be important to beware of the possibility of a right hemicolonic tumor.