[header] How to diagnose orthostatic hypotension [title] Notice dizziness when you stand. [step] The most common symptom of orthostatic hypotension is being dizzy when you stand up. This can happen after sitting or lying down for a time. 
The dizziness or lightheadedness generally only lasts for a few seconds. [substeps] You may find that the world spins around you and you need to grab onto something or sit back down for a moment.