“Science has proven that smiling releases endorphins and other hormones that make you feel good,” she says. “When you smile in a crowd and other people smile back, you can make the whole room feel ...

Rare, deadly, and often missed, some skin cancers develop in areas that rarely see the sun. Scientists are still learning about them, but here's what we know.

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Asthma (reactive airway disease) affects an estimated 34 million people in the U.S. Find in-depth asthma information, including treatments, triggers, and prevention.

WebMD's COPD Health Center provides in-depth information on chronic obstructive pulmonary disease including symptoms, causes, treatment options, diagnosis, and tests.

Your sleep position can make you more likely to snore, have back pain, or get a good night’s rest. Find out what effects your sleep position may have on your health.