Smoking is the main cause of chronic obstructive pulmonary disease (COPD), a serious, debilitating and often fatal illness. Take this quiz to find out more about COPD and how to prevent it.

Your target heart rate is the range at which sustained physical activity - running, cycling, swimming laps, or any other aerobic exercise - is considered safe and effective.

Sometimes, people who abuse drugs aren't aware they have a problem. This assessment is for people who regularly use drugs and wonder if they have issues with abuse or addiction.

An abdominal aortic aneurysm is a bulge in the form of a balloon that forms in a weakened area in the abdominal aorta, the largest blood vessel in the abdomen.

Learning you have breast cancer can be overwhelming. Many women face hard decisions about their care. A new study indicates that having a strong social network may help women better cope with a breast cancer diagnosis.