In general, colon polyps Yamada type IV are more serious. Colonic polyp is a morphological term that refers to elevated lesions in the mucosal layer of the colon, including neoplastic and non-neoplastic lesions, and is associated with inflammatory stimulation, heredity, gene mutation and other factors. It can manifest as intestinal bleeding, abdominal pain, diarrhea, intestinal obstruction, intussusception, etc. It can also be accompanied by anemia, wasting and other symptoms. Colonic polyps Yamada typing is a classification by Japanese experts based on the morphology and structure of the polyps, which is generally divided into four types: I, II, III and IV. Usually, the higher the typing, the higher the severity of the polyps. Yamada type IV refers to a colon polyp that has a clitoris and a longer basal clitoris, making it a more severe type of colon polyp that is more likely to show early cancerous changes. Colon polyp Yamada IV may present with abdominal pain, blood in the stool, mucus stool, and diarrhea. It is recommended to seek prompt medical attention for a definitive diagnosis and targeted treatment under a doctor’s supervision.