Headache, weakness, drowsiness, and easy fatigue may be caused by the following conditions: First, it may be due to cerebrovascular diseases, which commonly include cerebral hemorrhage, cerebral embolism, cerebral infarction, cerebral artery malformation, etc. When the brain has cerebrovascular diseases, it can lead to ischemia and hypoxia of the diseased cerebral vessels, thus causing impaired blood supply and oxygen supply to the brain, which can cause damage to brain cells or brain nerves, thus causing brain nerves and Brain cells cannot perform normal physiological functions, there will be headaches, weakness, drowsiness, and easy fatigue. Second, because there is hypertension, when the blood pressure rises can cause the cerebral blood vessels to be stimulated by dilatation, which can also cause damage to the intima, and the cerebral blood flow state will also be abnormal. For example, the blood flow of cerebral blood vessels will decrease, which can also cause damage to brain cells and brain nerves, thus causing headache, weakness, and easy fatigue.