How do I know if I have high blood pressure?

Most people with high blood pressure don't have any symptoms. The only way to find out is to have your blood pressure measured.Everyone's blood pressure goes up and down at different times of the day. Sometimes it can be higher when you're anxious or stressed. Usually your doctor or nurse will take your blood pressure several times before deciding if you have high blood pressure. Then your doctor may prescribe medication to lower your blood pressure.There isn't a fixed threshold between normal and high blood pressure. But generally a pressure below 140/90mmHg would be considered normal.