When children have tummy pain and fever, it is important to find the specific cause for treatment and not just to give the child fever-reducing treatment. First of all, an ultrasound of the abdomen should be done to rule out appendicitis or mesenteric lymphadenitis as the cause of the stomach pain and fever. If appendicitis is the cause of the stomach pain and fever, the child should be treated with surgery as soon as possible for better results. If the stomach pain and fever are caused by mesenteric lymphadenitis, the child should be treated with anti-inflammatory drugs and antipyretic medication. If you are not allergic to cephalosporins, you can use pediatric cefixime granules for anti-inflammatory treatment and ibuprofen suspension for fever reduction. However, oral ibuprofen suspension is recommended only when the body temperature is greater than 38.5°C. If the body temperature is below 38.5°C, fever reduction treatment with pediatric black cephalexin granules is sufficient. If there is no obvious abnormality in the ultrasound, it is likely that the stomach pain and fever are caused by acute gastroenteritis, and the diagnosis can often be confirmed by checking the stool routine or blood routine. Depending on the type of infection, you need to choose the appropriate antibiotics or antiviral drugs to give your child oral medication, and you can also use ibuprofen to reduce heat treatment.