The oral medication for 9-year-old children with stomach pain is different according to the cause: 1. If the stomach pain is caused by acute gastroenteritis or indigestion, anti-inflammatory drugs such as cefixime or amoxicillin granules should be applied if necessary, while oral medication to help gastrointestinal digestion, such as spleen-awakening and child-raising granules or lactobacillus granules should be given together for treatment. If the abdominal distension is obvious, the child should be treated with corky gel to relieve the symptoms of abdominal distension, and the abdominal pain will disappear. 2. If the abdominal pain is caused by appendicitis, oral anti-inflammatory drugs, such as cefixime, can be given for anti-inflammatory treatment in mild cases. If the effect of oral medication is not obvious, it is necessary to go to the hospital for intravenous infusion treatment if necessary, and surgery is required for severe cases. 3. common is mesenteric lymphadenitis, which is abdominal pain caused by enlarged lymph nodes around the intestine due to various reasons. In addition to oral anti-inflammatory treatment with cephalosporin, cefixime, or penicillin, amoxicillin pellets, you can also take Yuanhu pain relief pills orally and pay attention to keeping the abdomen warm. Severe cases also need to go to the hospital to apply cephalosporin or penicillin anti-inflammatory drugs, intravenous infusion treatment.