Vomiting syncope may be a symptom of vasovagal syncope, epilepsy, acute cerebrovascular disease and other diseases. 1. Vasovagal syncope: it is usually caused by factors such as pain stimulation or emotional stimulation, leading to nerve reflexes and vagus nerve excitation. As the patient’s heart rate slows down and blood pressure drops, resulting in insufficient blood supply and oxygenation to the brain tissue, it may cause vomiting and fainting symptoms, which may also be accompanied by pale face and unclear consciousness. 2. Epilepsy: If there is a history of epilepsy and seizures are triggered by certain adverse factors, such as emotional and dietary stimuli, it may cause vomiting and fainting symptoms, which may be accompanied by foaming at the mouth and crooked eyes. Consider that it may be caused by abnormal discharge of neurons in the brain. 3. Acute cerebrovascular disease: common in transient ischemic attack, acute cerebral infarction, cerebral hemorrhage and other diseases, due to local cerebral ischemia or hemorrhage, resulting in damage to cerebral nerves, causing cerebral dysfunction, and may show symptoms of neurological deficits such as vomiting, fainting and other symptoms, which may be accompanied by dizziness, headache and other manifestations. Vomiting and fainting may also be caused by other reasons, it is recommended to go to the regular hospital in time, through the improvement of the relevant examination, to clarify the cause of the disease, and then give targeted treatment.