Headache and vomiting may be caused by high blood pressure, migraine, intracranial infection, brain tumor, acute cerebrovascular lesions and other factors. 1. Hypertension: if the patient has high blood pressure and does not take medication reasonably, when the blood pressure increases gradually, it will cause headache and vomiting, which may be accompanied by dizziness and swelling, and in serious cases, it may lead to cerebrovascular rupture and bleeding. 2. Migraine: patients with a history of migraine, under the influence of mental and psychological stress, lack of sleep, excessive alcohol consumption and other triggers, may cause migraine attacks, headache and vomiting symptoms, may also be accompanied by fear of sound and fear of light and other symptoms, and is prone to recurring episodes. 3. Intracranial infection: such as encephalitis, meningitis, etc., which may be related to infectious factors, and the aggravation of the infection will cause headache and vomiting symptoms, which may be accompanied by fatigue, dizziness, high fever and other symptoms. 4. Brain tumor: when there is a tumor in the brain, with the increase of tumor volume, it may lead to the increase of intracranial pressure, which will cause headache and vomiting symptoms, and may be accompanied by visual field defects, blurred vision and other symptoms. 5. Acute cerebrovascular disease: for example, acute cerebral infarction or acute cerebral hemorrhage, the typical symptoms are headache, dizziness, nausea, vomiting, which may be accompanied by limb dysfunction and speech disorder. Headache and vomiting may also be caused by other reasons, it is recommended that the patient consult a doctor in a timely manner to clarify the cause, and under the guidance of the doctor to actively treat to avoid delays in the condition.