A 4-year-old girl who says her stomach hurts every afternoon or evening may be due to chronic enteritis, chronic appendicitis, mesenteric lymphadenitis and other diseases. 1. Chronic enteritis: it is usually caused by the extension or recurrence of acute enteritis, and it is also related to infection, immunity, environment and other factors. It may cause a 4-year-old girl to say that her stomach hurts every afternoon or evening, and some patients may also experience weakness and mental instability. 2. Chronic appendicitis: generally from acute appendicitis, and with bacterial invasion, appendix lumen blockage and other conditions. Patients often have pain in the right lower abdomen, which can be recurrent and prolonged, and some patients may also have stomach pain in the afternoon or evening. 3. Mesenteric lymphadenitis: usually due to bacterial, parasitic, viral infections. Patients often have fever, abdominal pain, vomiting and other symptoms, and some patients can also be manifested in the afternoon or night to say stomach pain. There may be other reasons for a 4-year-old girl to say her stomach hurts every afternoon or evening, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.