Absolutely. There can be a sudden drop in your blood pressure when standing from a sitting or lying position that can cause you to faint.
Yes. Yes if your blood pressure drops below your threshold pressure, which varies from person to person. If your BP is unable to adequately perfuse your brain, you will faint.
Was leaning over on my phone for a few minutes when I stood up 3/4ths of my vision blacked out. Was this just orthostatic hypotension and is it benign?
You are correct. This is orthostatic hypotension, which in a young person usually indicates some degree of dehydration. This is much more likely if you are in a hot environment. Be sure to drink enough water so that when voiding, the urine looks like water to be sure that you are not dehydrated at all. Changing posture a little more slowly will also prevent this by giving more time for adjustment of the bp. Read more...