The child’s stomach ache headache and fever may be caused by respiratory tract infection, rhinitis, inflammation of the mesenteric lymph nodes and other reasons. 1. Respiratory tract infection: children’s fever, headache and stomachache, the most common is respiratory tract infection, which will lead to children’s fever and then cause headache, may be accompanied by spasm of the stomach and intestines, so this situation will lead to children’s fever, headache, stomach pain and so on. 2. Rhinitis: Children suffering from rhinitis can lead to fever, which is caused by rhinitis, and an irrational diet during this period can lead to digestive dysfunction in children, and can even lead to abdominal pain. 3. Inflammation of the mesenteric lymph nodes: viral infections can also lead to fever in children, which can cause headaches and may be accompanied by inflammation of the mesenteric lymph nodes, which can also cause stomach pain. If your child has a stomach ache, headache and fever, and continues to be unrelieved, you should seek medical attention as soon as possible to avoid aggravation of the condition.