Orthostatic Hypotension By Andrea D Thompson, MD, PhD, University of Michigan; Michael J Shea, MD, Michigan Medicine at the University of Michigan Reviewed / Revised Jul 2022 | Modified Sep 2022 View Patient Education Pathophysiology Etiology Evaluation Treatment Geriatrics Essentials: Orthostatic Hypotension Key Points More Information Topic Resources Causes of Orthostatic Hypotension Orthostatic (postural) hypotension is an excessive fall in blood pressure (BP) when an upright position is assumed.