Rectal occlusion is a general term for a preliminary diagnosis of rectal deformation or stricture due to a new organism in the rectal wall or around the rectum after a preliminary examination, such as an imaging study. Before rectal cancer is diagnosed, clinicians often write rectal occupancy, which includes other intestinal lesions, such as rectal cancer, rectal adenoma, rectal abscess or hematoma, and also pelvic masses that squeeze the intestinal wall in the process of growth, causing the rectal wall to protrude into the intestinal cavity, which can often be written as rectal occupancy. Rectal occupancy is the preliminary diagnosis commonly used in clinical practice. To identify what the nature of rectal occupancy is, it often requires further examination through rectal finger examination, proctoscopy, CT or MRI, ultrasound, and sigmoidoscopy, and the final diagnosis will be obtained through pathology, because pathological diagnosis is the final diagnosis to determine the nature of rectal masses.