Heart disease is the number one killer of women in the U.S. And the top cause of heart attacks in young women under the age of 50 is SCAD, which stands for Spontaneous Coronary Artery Dissection. 

KSHB talked to Dana Garrison, a healthy and active woman who was diagnosed with SCAD after experiencing a sudden onset of symptoms at work.

"These patients are most generally otherwise healthy and otherwise have normal looking coronary arteries without plaque or cholesterol built up, " said Dr. Anna Grodzinsky, a cardiologist who specializes in SCAD and leads the SCAD data registry at Saint Luke's. "But they do have this finding of the tear of the coronary artery or blood vessel."

Watch the full story below.

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