There are many reasons that cause headache and nausea, common reasons: 1, patients with hypertensive cerebral hemorrhage, due to the elevation of blood pressure caused by intracerebral artery rupture blood will overflow from the blood vessels and pressure on the brain tissue, brain cell degeneration, necrosis, will be manifested as a headache, nausea, it is recommended that the patient to do a head CT examination. 2, subarachnoid hemorrhage: commonly caused by the rupture of the aneurysm, the clinic can be present Headache, nausea and vomiting.3. It is common that patients may have intracranial occupational diseases, such as brain tumors or gliomas, and the patients have increased intracranial pressure, which manifests as headache and nausea, and the funduscopic examination can find that the optic nerve papilla of the patients is edematous.4. It is common that patients may suffer from infectious diseases, and the infection of encephalitis and meningitis of the central nervous system will cause headache and nausea, and the upper respiratory infection will have headache and nausea as well, nausea.