Why You Get Dizzy Standing Up

Ever stand up fast and suddenly feel dizzy like your vision dims or you see

stars? That moment is your blood pressure playing catch-up. When you stand,

gravity pulls blood toward your legs. For a moment, less blood returns to your heart.

With less blood returning, the next heartbeat may push out less blood than

usual. That can briefly lower blood pressure meaning less oxygen-rich blood reaches your

brain for a few seconds. Your body has an automatic fix: sensors in big

arteries notice the drop and trigger a fast response. The response is: heart rate increases

a bit, and blood vessels tighten pushing blood back up. When that response