Former NASA Consultant, Dr. Sam Walters, has put out an urgent public heart health announcement.
Most people don't realize that pain in their upper back is a serious heart attack warning sign.
It can feel like a knife being twisted between your shoulder blades.
But that's far from the sneakiest warning sign of a heart attack.
It's far more deceptive and not knowing it could be fatal.
==> Sneakiest Heart Attack Warning EVER?