A helpful guide to how your heart's electrical system works, complete with a diagram.

An exercise stress test shows your heart's response to exercise. The test records your heartbeat while you walk on a treadmill or ride a stationary bike. It can be done in a hospital, a test center, or a healthcare provider's office. The test is also called a stress electrocardiogram (ECG/EKG).

You may have had angina, dizziness, or other symptoms of heart trouble. To help diagnose your problem, your health care provider may advise a cardiac catheterization. This common procedure is sometimes also used to treat a heart problem. Learn what to expect before, during, and after the procedure.

Colds are caused by viruses. They can't be cured with antibiotics. But you can ease symptoms and help your body's efforts to heal itself. Read on for details.

A person with HIV can look and feel perfectly healthy. But that person can give HIV to others as soon as they're infected with the virus. Read on to learn more.

Anxiety can become a problem when it's hard to control, occurs for months, and interferes with important parts of your life. Here are details about anxiety and when you might need to get help.

Taking proper care of your wound will help it heal. Read about the basic steps to follow.

Quitting smoking is one of the best things you can do to keep your heart disease from getting worse. Here are some helpful tips to get you started.

You can usually do almost everything you did before you got your pacemaker. See your doctor regularly to help ensure that you remain healthy and feeling good. Here are some things to avoid.

Your incision may be open to the air by the time you go home. But if you need to change your dressing, follow these steps.