Haemorrhoids and all that.
D000328:Adult; D001003:Anal Canal / Q000098:blood supply; D003672:Defecation; D006484:Hemorrhoids / Q000150:complications / Q000175:diagnosis / Q000473:pathology*; D006801:Humans; D007231:Infant, Newborn; D012003:Rectal Fistula / Q000150:complications; D012005:Rectal Prolapse / Q000150:complications