The 5-year-old baby always said stomach pain may be related to intestinal parasitic infection, ulcerative colitis and other factors. 1. Intestinal parasitic infection: if it is roundworm, pinworm, tapeworm, hookworm infection will cause symptoms of stomach pain, some children will be accompanied by anemia, weight gain. 2. Ulcerative colitis: due to bacterial and viral infections, 5-year-old babies have poor immune function, inducing non-specific chronic inflammation of the gastrointestinal tract. The baby can show abdominal pain, which can also be accompanied by diarrhea, abdominal distension and other symptoms. 5-year-old baby always say stomach pain, there may also be other reasons, such as mesenteric lymph node swelling, etc., it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then under the guidance of the doctor to give targeted treatment or treatment.