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Asthma is a disease that affects the lungs. It is the most common long-term disease of children. Test your knowledge of living with asthma with this quiz.

Answer this one: The STD chlamydia is a bacterium that is transmitted through intimate physical contact. What's the most common means of transmission?

True or false: More than 200 viruses cause colds.

A concussion is caused by a blow or jolt to the head. It is also called a traumatic brain injury. Find out more about concussions by taking this quiz.

Many people with asthma have symptoms from triggers at work. This is called occupational asthma. Read on to find out how to get help with this problem.

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.

One variant of this illness is known as "mad cow disease." To help make sense of this puzzling disease, take this quiz.

Cystic fibrosis (CF) is an inherited, often fatal disease of the body's mucus glands. It affects about 30,000 children and young adults in the United States, most of them descendants of people from northern Europe. Find out more about CF by taking this quiz.

Peripheral neuropathy is a term that refers to temporary or permanent damage to the peripheral nerves – the nerves that carry information to and from the brain and spinal cord to the rest of the body. This damage is one of the most common complications of diabetes.

You hear a lot about fiber and why you need it. But what is it? Learn more about this important part of your diet by taking this quiz.