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

High blood pressure affects I in 4 American adults. Find in-depth high blood pressure and hypertension information including its causes, symptoms, and treatments.

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.