More than a 100 years ago, doctors thought that too much running or other vigorous activity could harm us. Marathoner Clarence DeMar proved them wrong.

By remotely monitoring and educating new moms after they go home, providers are catching potentially fatal conditions, like heart failure and stroke.

Just a night or two of exposure to faint light is enough to raise your pulse and increase insulin resistance — factors that increase the risk of heart disease and diabetes, researchers find.

Cardiologist Sandeep Jauhar has been obsessed with the heart ever since he was young. He's seen firsthand how trauma, heartbreak, and grief can impact our hearts in shocking ways.