What causes stomach pain and diarrhea after eating?

Common causes of abdominal pain and diarrhea after eating include: 1. Gastrointestinal infection: Caused by viruses, bacteria, or parasites, often accompanied by symptoms such as fever and vomiting. Treatment may require antibiotics or antiviral medications. 2. Food allergy: An allergic reaction to certain foods (such as peanuts, milk, eggs), leading to abnormal immune responses and symptoms like abdominal pain and diarrhea. Avoidance of allergens and possible use of antihistamine medications are recommended. 3. Indigestion: Resulting from weak gastrointestinal function or improper eating habits, causing symptoms such as nausea, vomiting, and diarrhea. Improvement can be achieved through dietary adjustments or medication. 4. Irritable bowel syndrome (IBS): A functional gastrointestinal disorder characterized by abdominal pain, diarrhea, or constipation. It may be related to gut microbiota imbalance, food intolerance, or psychological stress. Comprehensive management is required.