The child’s headache, nausea and vomiting fever may be caused by meningitis, upper respiratory tract infection, appendicitis and other reasons. 1. Meningitis: Meningitis is mainly characterized by fever, headache, vomiting, and impaired consciousness. Headache does not change with the change of body temperature, vomiting is jet-like, and in severe cases, spasm and coma may occur. 2. Upper respiratory tract infection: headache, neuralgia, fever, vomiting and other symptoms will appear after acute upper respiratory tract infection. 3. Appendicitis: if it is caused by the obstruction of the appendix lumen or bacterial infection, then there will be pain in the right lower abdomen, accompanied by dizziness, headache, nausea, vomiting, diarrhea, fatigue, fever and other symptoms. Children with headache, nausea, vomiting and fever may also have other causes, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.