15-year-old children with stomach pain and diarrhea, do not want to eat can be seen in infectious diarrhea disease, acute appendicitis and other conditions, specific need to be analyzed according to the child’s situation. 1. Infectious diarrhea disease: such as Escherichia coli and other causes of infectious diarrhea, clinical abdominal pain, diarrhea symptoms, some of the children may appear depressed, poor appetite and other manifestations, improve the routine stool examination can be seen in the leukocyte increase. 2. Acute appendicitis: a common surgical disease of the digestive tract, abdominal pain is the main symptom of the disease, often manifested as periumbilical pain and metastatic right lower abdominal pain, some children may not be typical abdominal pain, due to local irritation of the intestinal tract, diarrhea symptoms can also occur, the course of the disease can affect the appetite, appearing “do not want to eat” phenomenon. 3. Other: such as allergic purpura, in addition to the rash, can be involved in the digestive tract, gastrointestinal symptoms, such as abdominal pain, diarrhea, some of the children to improve the stool routine examination can be seen in the red blood cells. It is recommended to consult a specialist to assess the condition and determine the cause of the disease.