Lung cancer is an abnormal growth of cells that starts in the lungs. Lung cancer is one of the most common forms of cancer in the US and is the leading cause of cancer deaths in both men and women.
When you breathe, the lungs bring oxygen into the body and take out carbon dioxide. Carbon dioxide is a waste product of the body’s cells.
Lung cancer can spread to other parts of the body, most often to the liver, brain, bones and other parts of the lungs, including the outer lining (called the pleura). Cancer from other parts of the body may also spread to the lungs, but it is different from cancer that starts in the lungs.