As the name implies, proctitis is mainly an inflammatory lesion involving the rectum, which is a common intestinal disease of the digestive system. Clinically, proctitis can be divided into acute proctitis and chronic proctitis. The main causes of proctitis may be related to the following factors: First, foreign body injury in the rectum. Undigested bone fragments, wood chips, or other foreign objects with sharp corners can directly damage the rectal mucosa and cause proctitis. In addition, the occurrence of severe constipation when the hard stool block, can cause proctitis. The second, unclean sex, such as some AIDS patients or gay men for anal sex, the action is too rough, the rectum caused damage may also cause proctitis. The third, radiation, such as some cervical cancer, bladder cancer patients undergoing radiotherapy, radiation damage to the rectum can also lead to proctitis. The fourth, poisoning or infection, the occurrence of rodenticide or heavy metal mercury, arsenic and other poisoning or the occurrence of infectious diseases characterized by gastroenteritis, often secondary to proctitis. The fifth, dietary factors, high-fat, high-protein, low-fiber diet is related to the development of proctitis. This is because high-fat foods can increase bile secretion, promote the growth of intestinal bacteria, and promote the onset of proctitis. Sixth, chronic inflammatory stimuli long-term chronic inflammation such as chronic bacterial infection, amoebic dysentery, chronic non-specific colitis, diverticulitis, etc., can make inflammatory changes in the mucosa. The main clinical manifestations of patients with proctitis include abnormal stools, urgency, mucus and blood, constipation, and sometimes alternating diarrhea and constipation. The diagnosis of proctitis patients can be made by anal finger examination and anoscopy. In conclusion, proctitis is a common disease that mainly involves the rectum. Patients may experience a feeling of anal swelling as well as bloody stools, constipation, and diarrhea.