The clinical manifestations of intestinal obstruction have four major symptoms, which are simply described as pain, distension, vomiting and closure, as follows: 1. Pain: abdominal pain, including continuous pain, paroxysmal intensification, or paroxysmal abdominal pain. 2. Distension: abdominal distension, due to obstruction of intestinal patency, resulting in increased pressure in the intestinal cavity, causing thinning of the intestinal wall and impaired blood circulation in the intestinal wall, resulting in abdominal distension. 3. Vomiting: vomiting and nausea, mainly because The obstruction of the digestive tract causes the contents of the intestine not to be transported down, resulting in the patient’s nausea and vomiting, vomiting out the contents from the mouth. 4.Closing: that is, stopping defecation and exhaustion. Cancerous intestinal obstruction is an intestinal obstruction, so the main basic manifestations of cancerous intestinal obstruction are also the four major symptoms and signs of pain, distension, vomiting and closure. Therefore, people pay more attention to these conditions in clinical practice.