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.

Hysterectomy is a major surgical procedure in which the uterus and possibly the cervix, ovaries, and fallopian tubes are removed. Fibroids in the uterus are a common reason for a hysterectomy. In this video, you'll find out other medical conditions that may require a hysterectomy and what to expect if you need this procedure.

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.