Clinically, patients are very nervous when it comes to “polyps”. They are anxious about “whether it is cancer or not”. In fact, polyp is a general term for bulging lesions in the colon and rectum. In the early stage, there may be no symptoms, but the general clinical manifestations may include abdominal pain, diarrhea, blood in the stool, mucus in the stool, or with a feeling of urgency. There are several clinical types: 1, inflammatory polyps: also known as pseudopolyposis, is a polypoid granuloma caused by long-term chronic inflammation of the intestinal mucosa, such polyps are mostly seen in patients with colitis. Often multiple, most smaller, often less than 1 cm in diameter, the longer the course of the disease, the volume can increase. The shape is more narrow, long, broad and distally irregular. Often with the control of inflammation has the possibility of shrinking. 2, juvenile polyps: 90% of them occur in children under 10 years old, and they are more common in boys. They are round or ovoid in appearance, with smooth surface. 90% of them grow within 25 cm from the anus, most of them are less than 1 cm in diameter, most of them have tips, about 25% are multiple, and histologically they appear as well-differentiated but irregularly sized glands. 3.Adenoma: Colonic adenoma is a benign epithelial tumor of the large intestine. According to the histological structure, there are three types of adenomas, namely tubular adenoma, villous adenoma and mixed adenoma. The histology of adenoma is divided into three types, namely, tubular adenoma, villous adenoma and mixed adenoma. ①Tubular adenoma: a round or oval polyp with smooth surface or lobulated, varying in size, but most of them are less than 1 cm in diameter. 80% have a tip. The histology shows a majority of tubular glands with immature cells distributed at all levels of the gland. There may be varying degrees of mesenchymal changes and sometimes a small amount of papillary hyperplasia. The carcinoma rate is about 5%. ②Choroidal adenoma: It is less common than tubular adenoma, and most of them are solitary. Most of them are broad-based, and about 10-20% can have a tip. The surface is dark red, rough or villi-like protruding. The distribution is most frequent in the rectum, followed by the sigmoid colon. Histologically, the epithelium grows in a papillary pattern, with a vascular connective tissue mesenchyme in the center, which also proliferates together with the epithelium, and the epithelium grows in a papillary pattern, with many interstitial changes in the epithelium. Its cancer rate is more than 10 times greater than that of tubular adenoma. (3) Mixed adenoma: It is an adenoma with both of the above structures. Its cancer rate is between that of tubular adenoma and villous adenoma.