Symptoms of cerebral congestion are mainly a sharp increase in intracranial pressure, confusion, headache, nausea and vomiting. Cerebral congestion refers to a patient’s passive dilation of cerebral blood vessels as a result of a rapid rise in mean arterial pressure over a very short period of time, to above 180 mmHg, when the cerebral blood flow autoregulation mechanism collapses. Cerebral blood flow increases, and the pressure within the cerebral vessels exceeds the pressure in the interstitium, leading to extravasation of fluid from the vascular bed and even cerebral edema as well as increased intracranial pressure. The patient’s blood pressure is further elevated, leading to spasm of the small cerebral arteries and aggravation of the condition, as a result of which the patient develops headache, nausea, vomiting, and even delirium, and in some cases, the clinical symptoms of epileptic seizures. If not treated in time, the patient is likely to die as a result.