Add Yahoo as a preferred source to see more of our stories on Google. Summer McKesson poses at her home in Atlanta on September 26. - Austin Steele/CNN Summer McKesson struggled to breathe for years.

Add Yahoo as a preferred source to see more of our stories on Google. Don’t ever underestimate the power of DNA on your beating heart, as it can be the root cause of heart failure. Dr. Travis Hinson, ...

Some of your most important life partners are the mitochondria that power all your cells. You and these little cellular ...

(CNN) — Summer McKesson struggled to breathe for years. Doctors told her it was because her blood would not stop clotting – and they couldn’t figure out why. A single clot alone can be lethal; but the ...