Learn more about the common causes of fainting and lightheadedness, including dehydration, low blood sugar, heart issues, flu ...

Picture this: you’re standing in line at the grocery store when suddenly you feel dizzy, nauseous, and before you know it, you’re waking up on the floor with concerned strangers hovering over you. If ...

Fainting at the sight of blood is common to many people and usually occurs without warning. Again, it is unrelated to fear or squeamishness; rather, it involves elaborate physiological mechanisms.