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True or false: Polio vaccines should be kept up-to-date throughout your lifetime.

More than 18 million Americans have been diagnosed with diabetes and more than 5 million more have diabetes but don't realize it, according to the CDC. Yet diabetes is the sixth leading cause of death in the United States.

At any given time, millions of people in the U.S. are trying to lose weight. They spend billions of dollars each year on weight-loss products and services. Learn more about diets and weight loss by taking this quiz.

Ewing sarcoma is a type of cancer that most often starts in the bone. It can also start in soft tissues. Learn more about symptoms, diagnosis, and treatments.

Make a list of questions and bring them to your appointments. These can cover how to decide on treatment, how to get ready for treatment, and how to cope during treatment.

There is an epidemic of obesity in this country, health experts say. But what is obesity? How is it measured?

Rituals such as hand washing, counting, checking or cleaning are often performed in hope of preventing obsessive thoughts or making them go away. Performing these rituals, however, provides only temporary relief, and not performing them markedly increases anxiety. Left untreated, obsessions and the need to perform rituals can take over a person's life. OCD is often a chronic, relapsing illness.