Why am I suddenly experiencing severe dizziness when I stand up?
1. Introduction Experiencing a sudden, severe sensation of dizziness or lightheadedness upon standing is a classic presentation of orthostatic hypotension. This condition occurs when the cardiovascular system fails to adequately adjust to the gravitational shifts in blood volume that happen during an upright postural change. As a result, transient cerebral hypoperfusion—a temporary drop in blood … Read more