A detailed look at the respiratory system and how it works.
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.
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.
People who have AIDS are much more likely to get certain types of cancer than people without the disease.
Carcinoid tumor is a rare type of tumor that grows slowly.
A lung nodule is a small growth on the lungs.