The causes of vomiting due to headache are as follows: First, if the headache is migraine or neuropathic headache, when the headache is severe, it will have some effect on the central nerve of the brain, which will easily stimulate the sympathetic nerve of the patient and cause the patient to vomit. Secondly, the phenomenon of headache and vomiting occurs when the patient’s intracranial pressure is elevated, which is related to the elevated intracranial pressure. For example, patients with cerebral edema or cerebral hemorrhage, cerebral infarction and other causes of increased intracranial pressure, or encephalitis, meningitis and other diseases can lead to vomiting. In the case of vomiting caused by cerebral hemorrhage, the patient often shows jet-like vomiting.