<unk>  is an autosomal dominant genetic condition characterized by the appearance of multiple<unk>  polyps in the gastrointestinal tract. Polyps are abnormal growths arising from a mucous membrane. These usually begin appearing before age 20, but the term<unk>  refers to the type of polyp (i.e benign hamartoma, as opposed to adenoma for example), not to the age of the affected person. While the majority of the polyps found in<unk>  are non-neoplastic, hamartomatous, self-limiting and benign, there is an increased risk of adenocarcinoma. Solitary<unk>  polyps most commonly occur in the rectum and present with rectal bleeding. The World Health Organization criteria for diagnosis of<unk>  are one of either: # More than five<unk>  polyps in the colon or rectum; or #<unk>  polyps throughout the gastrointestinal tract; or # Any number of<unk>  polyps in a person with a family history of<unk>  polyposis.
Juvenile polyposis syndrome
Familial adenomatous polyposis
Serrated polyposis syndrome
Hereditary diffuse gastric cancer
Hereditary nonpolyposis colorectal cancer
MUTYH-associated polyposis
Peutz–Jeghers syndrome
Ogden syndrome