Rectal occupancy is not necessarily cancer. Rectal occupancy is a collective term for a preliminary diagnosis of abnormal new organisms in the rectum or outside the rectum that cause deformation or narrowing of the intestinal cavity. Rectal occupancy can be a benign rectal tumor or a malignant rectal tumor, or it can be caused by tumors of other organs outside the rectum that press on the rectum. In clinical practice, rectal occupancy is a primary diagnosis, and further relevant examinations are needed, such as pelvic CT, MRI, colonoscopy and pathological sectioning under colonoscopy, as well as intracavitary ultrasound. The diagnosis of rectal cancer can be made only if the biopsy pathology indicates malignant tumor after some relevant examinations. Of course, there may also be rectal adenoma, perirectal abscess, pelvic tumor, etc., so further examination is needed to exclude the possibility of these diseases.