Symptoms of high fever, headache and vomiting are also relatively common in clinical practice. The diseases caused are mainly considered to be the following: Firstly, it may be caused by upper respiratory tract infection. Patients with upper respiratory tract infection will have symptoms such as headache, fever, nausea, vomiting, sore throat, nasal congestion and muscle aches, etc. If the infection is caused by a virus, oseltamivir, ribavirin and other drugs can be given to treat it. The second aspect, which causes headache, high fever and vomiting, may also be caused by central nervous system infection to, such as viral encephalitis or bacterial encephalitis, where the patient has a severe headache with jet-like vomiting, and may also be accompanied by stiffness and painful discomfort in the neck, which in severe cases may lead to impaired consciousness, inflexible limb movement and paralysis, which can be clarified by doing cerebrospinal fluid This can be clarified by a cerebrospinal fluid examination.