There are many reasons why children often have stomach pain, such as functional dyspepsia, chronic appendicitis, intestinal spasms and so on. 1. Functional dyspepsia: manifested as chronic, intermittent abdominal pain without organic lesions, which can be manifested as early satiety, belching, anorexia, epigastric pain, abdominal distension, heartburn, acid reflux, nausea and vomiting. 2. Chronic appendicitis: when chronic appendicitis occurs, frequent abdominal pain can also occur, mainly in the right lower abdomen, which can be caused by the obstruction of the appendiceal lumen and bacterial invasion. 3. intestinal spasm: mainly manifested as paroxysmal abdominal pain mainly around the umbilicus usually without obvious symptoms of diarrhea, vomiting, abdominal distension, etc., mostly related to the dietary environment as well as mental factors. Children often stomach pain may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.