There are many causes of vomiting and drowsiness, the common causes are mainly cerebrovascular disease, intracranial infection, epilepsy, as follows: 1, cerebrovascular disease: such as cerebral hemorrhage, large cerebral infarction and other diseases can cause increased intracranial pressure, dizziness, headache, vomiting jet vomiting, retinal edema and other clinical manifestations, serious cases can lead to drowsiness, coma and even death, need to improve the head-related examination, to clarify the specific 2, intracranial infection: is due to bacteria, viruses and other microbial infestation caused by brain tissue infection, not only will cause chills, high fever, nausea, vomiting symptoms, serious cases can lead to drowsiness, coma, improve the cerebrospinal fluid examination can be clearly diagnosed; 3, epilepsy: is due to abnormal neuronal discharge, mainly manifested as twitching of limbs, muscle tonicity, foaming at the mouth and other clinical manifestations. Clinical manifestations, when seizures are frequent, it is easy to cause damage to brain function and symptoms of drowsiness and coma, which require regular administration of antiepileptic drugs, such as sodium valproate and carbamazepine, to control symptomatic seizures.