Anorectal disease refer to various diseases that occur in the anus and rectum, are common diseases unique to human beings. In China, the incidence of anorectal diseases in the general population is 59.1%. There here are more than 30 common anorectal diseases, including hemorrhoids, fissures, fistulas, anorectal abscesses, proctitis, rectal prolapse, anal warts, canal cancer, anorectal stenosis, incontinence, etc.

The etiology of anorectal diseases is complex and divided into organic and functional diseases. The etiology of functional anorectal disease is unclear and may be related to abnormal coordination of the extraanal sphincter, puborectal muscle weakness, decreased rectal compliance, rectal sensorimotor dysfunction, decreased resting voltage of the internal sphincter, pelvic floor muscle spasm or excessive contraction, mental stress, anxiety, and other factors.