Whether or not colon 1.5 cm subtypical polyp is dangerous should be judged according to the pathological characteristics of the polyp, accompanied by symptoms, etc., if found should be promptly resected for treatment. Colonic subtypical polyps are categorized according to the morphology of the polyp, which is a kind of polyp between flat and with a tip, and colonic 1.5 cm subtypical polyp is a relatively large kind of polyp. After the discovery of polyps to take out the pathological tissue, pathological examination, if it is benign polyps, may appear diarrhea, constipation and other symptoms, generally does not have a serious danger, timely resection, do not worry too much. If the polyp is not resected in time, the polyp will continue to increase in size and may cause intestinal obstruction and bleeding. If it is malignant polyp, which is also known as colon cancer, the cancer cells may spread and symptoms such as blood in stool may occur, which is usually more serious. Endoscopic resection, chemotherapy, surgical resection and so on can be carried out, and regular rechecks should be carried out after the operation so as to avoid incomplete operation and metastasis of the cancer cells and so on. Colonic 1.5 cm subtympanic polyps should be under the guidance of the doctor, combined with the nature as well as the symptoms and other comprehensive judgment of the risk, and then carry out reasonable treatment.