What is the reason why I feel my head is not clear?

The

patient stays up late for a long time, leading to insufficient rest of the brain and the body, blood circulation slows down, blood cannot be supplied to the brain in time, can lead to transient ischemia of the brain, hypoxia, will cause the body to appear dizziness, brain is not clear; if the patient has hypertension, blood pressure continues to rise, blood vessel wall expansion, compression of surrounding tissues and nerves, can lead to dizziness, headache and other symptoms; If the patient brain tissue abnormal hyperplasia, the formation of brain tumor, due to increased intracranial pressure in the brain, but also can lead to the body appear not clear mind and dizziness symptoms.