Postural (Orthostatic) Hypotension

Postural hypotension is a quick drop in blood pressure that happens when you sit up or stand up. This can be a drop in your systolic blood pressure by 20 mmHg (top number) or your diastolic blood pressure by 10 mmHg (bottom number). It can make you feel dizzy or lightheaded. The feeling is often mild and goes away after a few seconds or minutes. Sometimes, the drop in blood pressure can be more severe and even cause people to faint.