passing out fainting causes
Passing out is super common, and we see young, healthy people passed out all the time, says Christopher Tedeschi, MD, a professor of emergency medicine at Columbia University Medical Center. Fainting happens when your brain isn't getting enough blood. And there are some cases that aren't totally harmless. A good gauge is the amount of time: Although your friend can recover easily after being passed out for a minute or two, you should be more worried if they're taking longer to come out of it.