HYPOTENSION, ORTHOSTATIC

Some symptoms of dizziness such as wooziness, feeling about to black out, and tunnel vision can be due to insufficient blood flow to the brain. The cause is transient low blood pressure (hypotension) due usually to suddenly standing up (orthostatic). The symptoms are typically worse when standing, improve with lying down and may be experienced by healthy individuals who rise quickly from a chair, often after a meal, and have a few seconds of disorientation.