There are many reasons for drowsiness in hypertensive patients, including insufficient blood supply to the brain caused by lower blood pressure, and cerebral hemorrhage and cerebral thrombosis caused by hypertension, as follows: 1. Insufficient blood supply to the brain caused by lower blood pressure: When blood pressure is too low, the blood supply to the brain is severely reduced, and when the blood supply to the brain is insufficient, patients are prone to drowsiness, drowsiness, and in serious cases, coma. 2. Cerebral hemorrhage: Once cerebral hemorrhage occurs, patients will become drowsy or comatose, and in serious cases, they may die. 3, cerebral thrombosis caused by high blood pressure: Patients with cerebral thrombosis tend to become drowsy or easily sleepy. There are many reasons for drowsiness, abnormal changes in blood pressure is only one of them, other reasons are, brain neuropathy, patients often stay up late, lack of sleep recently, or have serious lack of oxygen diseases, such as serious heart failure, serious lung diseases.