What Is Lung Cancer?
Lung cancer happens when cells in the lung change (or mutate). Most often, this is because of exposure to dangerous chemicals that we breathe. But lung cancer can also happen in people with no known exposure to toxic substances. Unlike normal cells, cancer cells grow uncontrollably and cluster together to form a tumor, destroying healthy lung tissue around them. Symptoms usually do not appear until cancer cells spread to other parts of the body and prevent other organs from functioning properly. At this point, it is harder to treat lung cancer.
Causes & Risk Factors
Types of Lung Cancer
Lung Cancer Symptoms & Diagnosis
Early Detection Is Important
Though lung cancer is common, many people don't know much about it or are afraid to learn. Lung cancer can go undiagnosed for a long time because symptoms usually do not appear until the cancer has spread. If you are over 55 and have a smoking history, you are at high risk and you may be eligible for lung cancer screening.
Page last updated: October 4, 2021