The most common symptom of hypertension is headache. When blood pressure is too high, headache is the main symptom and the earliest symptom. The main reason is that when blood pressure rises, the pressure in the blood vessels increases, which can cause increased pressure in the brain and increased cerebral perfusion, so it can manifest as headache. When a patient has a headache, blood pressure can be measured first, and if it is elevated, it can be treated with antihypertensive drugs. There are many causes of headaches, and high blood pressure is only one of them. The most common causes of headaches are migraine, neurological headache or tension headache. There is also a possibility of cerebral infarction or cerebral hemorrhage, and it is recommended to go to a regular hospital promptly.