Severe headaches are a sign of a rare form of high blood pressure called malignant hypertension. Malignant hypertension is exceedingly high blood pressure that creates abnormally high pressure in the cranium, the part of the skull that surrounds the brain. As the blood pressure increases to dangerous levels, pain builds up in the head, often causing migraines or severe headaches. Malignant hypertension is a medical emergency and should be treated promptly.
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