Bowel obstruction after surgery for rectal cancer may be caused by intestinal adhesion, or it may be caused by tumor recurrence in abdominal cavity, because if there is surgery in patient’s abdomen, adhesion will be formed inside the abdominal cavity, and it is more common for adhesion to be formed between the small intestine and the inside of the abdominal cavity, so adhesive bowel obstruction will be formed. If the patient’s symptoms are relatively mild, usually the abdominal pain is relatively mild, is paroxysmal, usually no nausea, vomiting, and no obvious anal stop defecation, defecation, of course, if the patient’s condition is aggravated or to eat indigestible food, may lead to an acute attack of intestinal obstruction, the patient will have obvious abdominal pain, abdominal distension accompanied by nausea, vomiting, as well as the anus stops defecation, defecation, etc., most of them are treated through internal medicine, conservative treatment, the patient’s condition are able to get the best results, the patient’s condition will be able to get the best result. Most of the patients can get better through internal medicine and conservative treatment. Of course, there is also the possibility of intestinal obstruction caused by tumor recurrence, because after rectal cancer surgery, it may lead to tumor recurrence. If the tumor has spread or planted in the abdominal cavity, intestinal obstruction may be formed. Usually, the condition of the patient will gradually aggravate with the prolongation of time, and the condition of the patient will gradually progress from incomplete intestinal obstruction to complete intestinal obstruction, and abdominal distension is very obvious, accompanied by fluid accumulation in the abdominal cavity, ascites, and at the same time, severe hypoproteinemia, malignant fluid, and so on.