The clinical manifestations of anorectal diseases have the following characteristics: 1. There are often similar clinical symptoms. It is impossible to diagnose what anorectal disease is based on symptoms alone without examination by a doctor. For example, there are internal hemorrhoids, anal fissures, anal fistulas, chronic colitis, proctitis, colorectal polyps, colorectal cancer, etc. that can cause blood in the stool. 2, rarely a single disease, often 2 to 3 kinds of complications, for example: chronic constipation, anal fissure and prolapse complications; hemorrhoids and anal skin disease complications and so on. 3. It is unlikely that the disease will heal itself without treatment. Instead, the disease worsens with delay and age, and even develops into a more serious disease. For example, some perianal abscesses can develop into anal fistulas, and some anal fistulas can develop into skin cancer; some intestinal polyps can deteriorate into intestinal cancer, etc.