A detailed look at the respiratory system and how it works.
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Diseases caused by smoking kill more than 480,000 people in the U.S. each year. Here's a look at the risks linked to smoking, as well as information to help you quit.
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Lung cancer often doesn't cause symptoms in its early stages. In fact, many lung cancers don't cause symptoms until they have already spread.
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People who have AIDS are much more likely to get certain types of cancer than people without the disease.
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Carcinoid tumor is a rare type of tumor that grows slowly.
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A lung nodule is a small growth on the lungs.
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