Multiple sclerosis is a disease of the central nervous system, the brain and spinal cord. Its symptoms can range from benign to severe. Find out more about this mysterious illness by taking this quiz.

Drinking can be an expensive habit. While you may not notice a dollar here or two dollars there, consider how much you spend per week and per year on alcohol.

Cancer of the colon or rectum (colorectal cancer) usually develops slowly, over several years. Excluding skin cancers, colorectal cancer is the third most common cancer in both men and women in the United States and the second leading cause of cancer-related deaths, according to the American Cancer Society (ACS). Still, the death rate from colorectal cancer has been dropping for the last 15 years because of better detection and treatment. Take this simple assessment to learn about your risks for colorectal cancer.

A peak flow meter for asthma is like a thermometer for a fever - it helps you monitor what's going on inside your lungs by measuring airflow out of the lungs. The meter can tell you if your airways are narrowing well before asthma symptoms begin. Learn how to use a peak flow meter, how to find your "personal best," and how to set your peak flow zones.

Most people have heard of diabetes – and may even know someone who has it. But what about prediabetes? If you aren't aware of it, you’re not the only one. A recent government report found that many Americans aren't familiar with the condition, even t

Information on more than 370 topics, featuring illustrations designed to clarify complex anatomy and procedures.

Tap into this interactive encyclopedia for instant access to information on more than 835 diseases and conditions.

Enjoy good health at every age: know your body and how it works, eat well and stay active, and follow a plan for disease prevention.