The clinical manifestations that cause the anus to always feel blocked by something, the causes include the following: 1. The reaction caused by severe internal hemorrhoids, which are varicose vessels inside the anus. If the clinical manifestation is more serious, it may even cause prolapse, which will block the anal opening. 2. caused by prolapse of the rectal mucosa itself, if the patient’s rectal mucosa is in a relaxed state, such as due to old age, or other rectal mucosal lesions, it will cause this uncomfortable feeling. 3. caused by tumors at the end of the rectum, which is a local growth, including relatively large polyps or rectal cancer The patient needs to undergo anoscopy, both of which require surgical treatment. 4, the reaction caused by constipation, abnormal function of the colon or rectum, causing the stool to stagnate at the end of the rectum, causing this clinical manifestation.