Medically reviewed by Richard N. Fogoros, MD Key Takeaways Vasovagal syncope often happens when standing or sitting up ...

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 ...

When the heart beats too fast or too slow, blood pressure can drop suddenly, reducing blood flow to the brain and causing a ...