When people with blood injury injection (BII) phobia encounter their fears—which include seeing blood, anticipating an injury, or getting a shot—their heart rate and blood pressure drop, sometimes so much that they faint.
What's Going On
Why It Matters
Editors' Picks: Our Favorite Videos About Phobias And Fainting
Why Do Some People Faint At The Sight Of Blood?
Hear what the experts think.
What Happens When You Faint?
It all starts in the vagus nerve.
Is Your Fear A Real Phobia?
Just because a fear has a name doesn't mean psychiatrists agree it's a real phobia.
Written by Curiosity Staff December 9, 2016
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