Intestinal obstruction and paralytic ileus are two possible complications after surgery. In order to distinguish and accurately diagnose mechanical intestinal obstruction or functional bowel paralysis after surgery, clinical examination and correct abdominal X-ray alone are not enough, it is necessary to use the method of computed tomography (CT).

Anesthesia for patients with full stomachs, the most frightening risk is that the patient inhales refluxed gastric juice through the esophagus into the airways causing pneumonia, this condition is called aspiration pneumonia (pneumonia caused by inhaling food, gastric acid).