Learn about acne with this multiple-choice quiz. You'll learn, for example, which factors promote blackheads.

Ready to start exercising, but don't know where to start? This quiz can get you off on the right foot.

Addiction to drugs or alcohol can happen to anyone of any age, social status, race, or income level. Find out more by taking this quiz.

Attention deficit/hyperactivity disorder (ADHD) is a common mental affecting millions of children.

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

How important is it to draw up a living will? Take this quiz and find out.

Millions of Americans are affected by age-related macular degeneration, a disease that damages the eye's central vision. To learn more about macular degeneration, take this quiz.

Misusing alcohol can lead to serious problems. Learn more about the effects of abusing alcohol by taking this quiz.

Allergies are nothing to sneeze at. Learn how to better deal with this condition.

Many people swear by alternative and complementary therapies. Find out more about these treatments by taking this quiz.

Gazing down on the spectacular view from a mountaintop can take your breath away. That breathlessness is oftentimes more than just an awestruck reaction to the sights. It can be a symptom of altitude sickness, an illness that can strike hikers, mountain climbers, skiers and anyone who hits the 8,000-foot mark on a mountain.

Find out more about this degenerative disease of the brain by taking this quiz.

Answer this one: What is the most common cause of anemia?

Anthrax is a serious disease that can affect the skin, lungs, and digestive tract. Learn more about this disease by taking this quiz.

Antibiotics have been called "wonder drugs," because of their ability to treat bacterial infections that were once deadly. Antibiotics have saved countless lives since they were first introduced 60 years ago. But over use of these drugs has allowed some bacteria to become resistant to them.

Aplastic anemia is a rare blood disorder that affects the growth of blood cells. "Aplastic" means "lack of growth."

The human appendix is a 3- to 6-inch narrow tube located where the small and large intestines join. It's mostly known for becoming inflamed, affecting thousands of Americans each year. To learn more about the appendix, take this quiz.

True or False: Arthritis affects only the wrist, ankle, and knee joints.

Each year, more than a million Americans die of heart attacks and other forms of heart disease. Low-dose aspirin therapy is one weapon in the arsenal against heart disease that also includes healthy dieting, adequate exercise, and not smoking. Learn more about aspirin's role in combating heart disease by taking this quiz

Find out how much you know about asthma basics with this quiz.