Children who are thin and often have abdominal pain may have parasitic disease, dyspepsia, chronic intestinal inflammation, etc. It is recommended to give deworming drugs, digestive aids, antibiotics, antidiarrheal drugs and other treatments according to the cause of the disease. 1. Parasitic disease: deworming drugs such as albendazole and mebendazole can be given to improve abdominal pain. 2. Dyspepsia: can be given to promote digestion, improve abdominal pain, with Saccharomyces boulardii, pepsin combination and other medications, such as oral solution of Sifu Tang, gastric digestion tablets. 3. Chronic enteritis: oral montelukast to stop diarrhea, the application of probiotics such as bifidobacteria to regulate intestinal flora, with the application of antibiotics, such as amoxicillin, cefaclor and other control of inflammation, and gradually improve abdominal pain, diarrhea. Children thin, often abdominal pain may have other reasons, it is recommended to consult a physician to standardize the use of medication.