High blood pressure (hypertension) is a blood pressure that is 140/90 mm Hg or above each time it is taken at the GP surgery, or home or ambulatory readings where the average is more than 135/85 mm Hg. You have high blood pressure if you have several blood pressure readings that are high, taken on different occasions, and when you are relaxed. If blood pressure has been high for some time, or very high, there can be changes in the blood vessels at the back of the eye. Other than the blood pressure reading being high, there isn't usually anything for the doctor to find on examination either. Even more occasionally, some people feel a bit dizzy, or their vision can be affected by high blood pressure. Occasionally if blood pressure is very high, you can get headaches. Usually high blood pressure is only picked up if blood pressure is checked routinely, or as part of checks for another medical problem. The vast majority of people with high blood pressure do not know they have it, until it causes a complication such as a stroke or heart attack. What are the symptoms of high blood pressure?
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