Peritoneal metastasis of intestinal cancer can produce ascites causing abdominal distension, in addition, abdominal distension may also be caused by intestinal obstruction. Bowel cancer mostly refers to colorectal cancer, which is a common malignant tumor of gastrointestinal tract, and is divided into three types according to the tumor morphology: ulcerative, mass, and infiltrative. Colorectal cancer mainly transfers to peripheral or distant lymph nodes through lymphatic transfer, but also transfers to liver, lung, bone and other parts of the body through blood transfer, and also transfers to the peritoneum through the implantation of shedding cancer cells. When cancer cells metastasize to the peritoneum, ascites can be caused by the blockage of lymphatic vessels or small blood vessels by cancer plugs, which is often a manifestation of advanced stage. In the late stage of colon cancer, there is often intestinal obstruction, which mainly manifests as abdominal distension and stopping defecation, abdominal distension or paroxysmal colic; when complete obstruction occurs, the symptoms will be aggravated. Colon cancer on the left side can sometimes take intestinal obstruction as the first symptom. Early symptoms of colorectal cancer are not obvious and easy to be neglected. At present, the treatment is mostly surgery-based comprehensive treatment, and professional doctors can be consulted for specific advice.