Sigmoid colon polyp is 1.5cm is a larger polyp, whether it is serious should be judged according to the nature of the polyp, such as benign polyp is relatively not serious, such as for the tumor is more serious, to be treated in a timely manner. The 1.5cm sigmoid colon polyp belongs to the larger polyp, such as pathologic biopsy to determine the benign polyp, relatively not serious, but may still lead to intestinal lumen narrowing, causing complete or incomplete intestinal obstruction performance. If it is a tumor polyp, such as sigmoid colon cancer, etc., it is still more serious, and it is recommended that the patient undergo standardized treatment in time. Generally, endoscopic polypectomy should be performed to relieve the pressure of polyps on the intestinal tract, relieve the patient’s symptoms and prevent polyps from becoming cancerous. If the polyp has become cancerous, surgical treatment is needed to remove the intestinal segment through surgery, and if there is lymph node metastasis, the regional lymph nodes should also be cleared, with radiotherapy treatment when needed. Patients should consult the doctor in time for a clear diagnosis and follow the doctor’s instructions for treatment.