What could be the cause of a child's stomach pain and fever?

Parents should have their children undergo a comprehensive examination, including routine blood tests, routine urine tests, and abdominal ultrasound, to determine the cause of illness. Parents should pay attention to their child's symptoms; if the fever lasts more than three days or the temperature exceeds 38°C, they should seek medical care promptly so that doctors can provide timely treatment and prevent adverse effects on the child's health. Additionally, parents should regularly monitor their child's health, paying particular attention during episodes of fever or abdominal pain, and take prompt measures to alleviate symptoms.