Juvenile gastrointestinal polyposis (JIP) is a rare condition characterized by the presence of juvenile hamartomatous polyps in the gastrointestinal (GI) tract. The disease is juvenile polyposis syndrome (MONDO_0017380, a Monarch Disease Ontology identifier). Also known as: JIP, JPS, jPS, juvenile gastrointestinal polyposis, juvenile intestinal polyposis, juvenile multiple polyps syndrome, juvenile polyposis, polyposis, juvenile intestinal.