If intestinal pain occurs, consider the following causes: 1. Consider the possibility of acute chronic enteritis, which is caused by bacterial infection of food, and chronic enteritis, which is caused by long-term bad habits and immune factors, such as Crohn’s disease and ulcerative colitis. 2. Consider the possibility of intestinal obstruction. 3. Consider patients with intestinal perforation, which usually comes on the basis of ulcers or parasitic roundworms. 4. The patient may have intestinal tumor or intestinal adhesions. 5. The patient may have colon tumor or tumor of other organs in the abdominal cavity. 6. The patient may have intestinal colic, mostly intestinal spasm caused by external factors, such as irritable bowel syndrome. 7. The patient may have intestinal dysfunction or imbalance of intestinal flora.