The most common cause of tummy pain in a 6-year-old child with a fever is mesenteric lymphadenitis. To confirm the diagnosis, you need to take your child for an ultrasound of the abdomen on an empty stomach. If the diagnosis of mesenteric lymphadenitis is confirmed, the child needs to be given some antibiotics for treatment. Generally cephalosporin is not allergic, you can choose pediatric cefixime granules for treatment. In addition to taking antibiotics, you also need to give your child a clockwise tummy rub, but also use a hot water bag compress will be better. In addition, the cause of the child’s stomach pain and fever is likely to be appendicitis, which also requires an ultrasound of the abdomen to confirm the diagnosis. If it is appendicitis, the situation is more complicated, and it is necessary to decide, based on the ultrasound results, whether to treat it surgically or conservatively.