Sigmoid colon Ca with stenosis, i.e. sigmoid colon cancer with stenosis, requires comprehensive treatment such as surgery and chemotherapy. 1. If there is acute intestinal obstruction in the case of sigmoid colon cancer with stenosis, enterostomy should be performed first, and then radical surgery for intestinal cancer should be performed in the second stage; if distant metastasis occurs, such as bone metastasis, only enterostomy can be performed. If it does not cause intestinal obstruction and there is no distant metastasis, radical surgery for intestinal cancer can be performed after gastrointestinal preparation as prescribed by doctor. 2. Chemotherapy: after sigmoid colon cancer causes stenosis, it is usually in middle or late stage, after this situation, chemotherapy is needed to improve the treatment effect, and the specific treatment plan needs to be decided by doctor according to the condition. Comprehensive examination, such as abdominal CT, etc., is needed to determine the severity of the disease before deciding how to treat it.