Human heart

Hearts have become iconic symbols of Valentine's Day, but when it comes to hearts in the real world, one size doesn't fit all — particularly in the animal kingdom.

That may be true for the short missions astronauts have gone on so far. But Mars will be a different story.

When it comes to "bad" cholesterol, lower is usually better. But a new study suggests it may be possible for cholesterol levels to be too low.

People with desk jobs may not need to feel so guilty about all those sedentary hours in an office chair.

A Nevada man is suing his doctor for allegedly leaving a nearly 5-foot wire in his body for more than a decade.

Scalpel,. Check. Sponge,. Check. Fire extinguisher...check?

Women undergoing fertility treatments may be at increased risk of a dangerous pregnancy condition called peripartum cardiomyopathy.

A drug for erectile dysfunction may also help treat heart failure, a preliminary study in animals suggests.

It has four chambers, blood vessels and it beats — sort of.

This unusual condition went undetected during the woman's lifetime.

A new study finds that drinking sugar-sweetened beverages is tied to an increased risk of early death.

Eggs are back in the news, with a new study concluding that regular consumption of the beloved breakfast food may increase the risk of heart disease after all.

Heart attack rates are increasing in what may seem like an unlikely group: adults in their 20s and 30s.

The brain decreases its chatter, the heart weakens and balloons up

The ability to do a lot of pushups may be a sign not only of strength, but also of good heart health, a new study suggests.