Headache and hypothermia can generally be registered with neurology or respiratory medicine. Headache with hypothermia is common in two possibilities: first, central nervous system infection, more commonly tuberculous meningoencephalitis, which can cause both headache and fever, while the body temperature is usually below 38.5℃ and more likely to appear in the late afternoon. Perfecting lumbar puncture, routine cerebrospinal fluid, biochemical and antacid staining, and cerebrospinal fluid cytology can help to identify; secondly, infections from other sites cause fever, and fever induces vascular headache. Infections from other sites are most common with respiratory tract infections, especially upper respiratory tract infections. Elderly people also often have lower respiratory tract infections, also known as pneumonia. This leads to fever later, which is often hypothermic because of the lack of response, and may also have tuberculous disease of the lungs. These infectious fevers usually induce vascular headaches, which are functional headaches without inflammatory intracranial lesions, and treatment requires antiviral or anti-infective therapy for the primary cause.