The head of the intestine is medically known as the anus, with the role of defecation and exhaust. The anus is located in the most terminal part of the digestive tract, upward connection to the rectum, downward opening to the outside of the body, in the surface of the anal canal is encompassed by a variety of epithelial tissues, the upper edge of the upper edge of the rectum and the rectum to form a toothed line, above the toothed line there is a rectal artery supply, below the toothed line there is a supply of the anus artery, the digestive tract of the excretory tract has a very important significance. The main common diseases in the anal area include hemorrhoids, perianal abscess, anal fistula, anal fissure, anal canal cancer, etc. When diagnosing these diseases, anal fingerprinting can be carried out first, especially for the discovery of malignant tumors in the rectum also has a certain role, and the clinic can carry out proctoscopy for clear diagnosis. When the patient is uncomfortable in the anal area, it is recommended to consult the anorectal department of regular hospitals for diagnosis and treatment.