Lung cancer is a type of cancer that starts in the lungs. Cancer starts when cells in the body begin to grow out of control. To learn more about how cancers start and spread, see What Is Cancer? Normal structure and function of the lungs Your lungs are 2 sponge-like organs in your chest. Your right lung has 3 sections, called lobes.
Learn about the causes and risk factors for lung cancer and what you can do to help lower your risk, such as quitting smoking. Know the signs and symptoms of lung cancer. Find out how lung cancer is tested for, diagnosed, and staged. If you have non-small cell lung learn about the treatment options and possible side effects.
Small cell lung cancer usually starts in cells that line the bronchi in the centre of the lungs. The main types of small cell lung cancer are small cell carcinoma and combined small cell carcinoma (mixed tumour with squamous or glandular cells).