Why Do I Feel Like I''m Going to Pass Out After Standing?
Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 22nd, 2026.
Feeling like you're going to pass out after standing is typically caused by orthostatic hypotension, a sudden drop in blood pressure. When you stand up quickly, gravity pulls blood toward your legs, temporarily reducing blood flow to your brain. Your blood pressure can drop by 20 mmHg or more within seconds of standing. Common causes include dehydration, certain medications, prolonged bed rest, or underlying conditions like diabetes or heart problems. This affects up to 20% of adults over 65. To minimize symptoms, stand up slowly, stay hydrated, and avoid standing for long periods without moving.
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