(1) Whether there is an intestinal obstruction exists: Based on abdominal pain, vomiting, abdominal distension, anus stopping defecation and排气, as well as changes in bowel sounds and X-ray examination, the diagnosis of intestinal obstruction is generally not difficult. However, in clinical practice, there are still cases where internal medicine diseases (acute gastroenteritis, explosive food poisoning, angina pectoris, allergic purpura, etc.) are mistaken for mechanical intestinal obstruction, leading to surgery and patient death. This requires attention.