Intestinal obstruction caused by peritonitis is clinically classified as paralytic intestinal obstruction, which means that there is no mechanical or organic lesion in the intestinal canal itself, but it is caused by inflammation or pus in the abdominal cavity, which stimulates the intestinal canal and causes weak peristalsis, and the contents of the intestinal cavity cannot be discharged smoothly. For paralytic intestinal obstruction caused by peritonitis, surgical treatment is usually ineffective and treatment is needed to address the primary cause of peritonitis. Clinically, acute diffuse peritonitis caused by perforated peptic ulcer, perforated appendix, or even perforated gallbladder is common and usually requires surgical treatment. Peptic ulcer perforation, such as repair of the perforated ulcer, appendectomy, and gallbladder removal, does not require surgical treatment for the intestinal canal itself, as long as the pus in the abdominal cavity is adequately drained and anti-infective treatment is performed with sensitive antibiotics for sensitive bacteria. After the treatment and cure of peritonitis, paralytic intestinal obstruction can usually recover on its own without surgical treatment of the intestinal canal itself.