Common anorectal diseases include hemorrhoids, anal fissure, perianal abscess, anal fistula, rectal prolapse, anal pruritus, anal eczema, and anorectal cancer. The common symptoms of anorectal diseases mainly include blood in stool, constipation, prolapse, pain, swelling, increased secretion, and anal dampness. If blood in the stool comes down in drips or jets, is bright red and painless, it is mostly internal hemorrhoids. If the stool is mixed with mucus or pus and blood, the color is dark, and there is a feeling of downward movement in the anus, the possibility of anorectal cancer should be considered. If the blood in stool is bright red, accompanied by anal pain and dry stool that is difficult to be relieved, it is mostly anal fissure. Mucus blood stool with dark red color, accompanied by abdominal pain, thin stool and increased frequency of stool is mostly chronic colitis. Prolapse can be seen in anal rectal prolapse and stage II and III internal hemorrhoids, but also in low rectal polyps and anal papillomas. Anal fissures, thrombosed external hemorrhoids, inflammatory external hemorrhoids, perianal abscesses, mixed hemorrhoids impaction, and post-operative hemorrhoids can present with significant pain, and perianal abscesses can present with redness, swelling, heat, and pain inside and outside the anus. Perianal fistula can appear from time to time with pus flowing from the broken skin around the anus.