Lung cancer is the third most common cancer in the U.S. It's caused by harmful cells in your lungs growing unchecked. Treatments include surgery, chemotherapy, immunotherapy, radiation and targeted drugs. Screening is recommended if you're at high risk. Advances in treatments have caused a significant decline in lung cancer deaths in recent years.
Lung cancer is a disease caused by uncontrolled cell division in your lungs. Your cells divide and make more copies of themselves as a part of their normal function. But sometimes, they get changes (mutations) that cause them to keep making more of themselves when they shouldn't. Damaged cells dividing uncontrollably create masses, or tumors, of tissue that eventually keep your organs from working properly.
Lung cancer is the name for cancers that start in your lungs — usually in the airways (bronchi or bronchioles) or small air sacs (alveoli). Cancers that start in other places and move to your lungs are usually named for where they start (your healthcare provider may refer to this as cancer that's metastatic to your lungs).
There are many cancers that affect the lungs, but we usually use the term "lung cancer" for two main kinds: non-small cell lung cancer and small cell lung cancer. Other types of cancer can start in or around your lungs, including lymphomas (cancer in your lymph nodes), sarcomas (cancer in your bones or soft tissue) and pleural mesothelioma (cancer in the lining of your lungs). These are treated differently and usually aren't referred to as lung cancer. (CREDITS: Cleveland Clinic)
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