The symptoms of headache caused by high blood pressure are mainly due to the following reasons: Firstly, if the blood pressure of hypertensive patients is too high and exceeds the regulation ability of the cerebral arteries, the amount of blood in the brain is more than usual, resulting in excessive perfusion of the brain, headache will occur, but this headache can generally improve on its own as the blood pressure decreases. Second, cerebral hemorrhage, long-term hypertension causes cerebrovascular ischemia and aneurysm formation, but the aneurysm rupture can cause cerebral hemorrhage, cerebral hemorrhage can be manifested as severe headache, examination of the brain CT can help clarify the diagnosis. Third, cerebral infarction, hypertension can cause atherosclerosis of cerebral arteries to narrow the lumen, once the atherosclerotic plaque is unstable and secondary changes such as rupture and bleeding occur, it can cause a large area of cerebral infarction, which can also manifest as headache, and examination of brain MRI and head CT can help to make a clear diagnosis.