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    Lung Cancer - Cause

    More than 8 out of 10 lung cancers are caused by smoking.3Tobacco smoke contains carcinogens-substances that cause cancer. These substances damage lung cells, and over time the damaged cells can turn into lung cancer.

    The more you smoke and the longer you have smoked, the higher your chances of getting lung cancer. You lower your chances when you quit or cut down on how much you smoke.

    Recommended Related to Lung Cancer

    Understanding Lung Cancer -- Diagnosis and Treatment

    If a routine physical exam reveals swollen lymph nodes above the collarbone, a mass in the abdomen, weak breathing, abnormal sounds in the lungs, dullness when the chest is tapped, abnormalities of the pupils, weakness or swollen veins in one of the arms, or even changes in the fingernails, a doctor may suspect a lung tumor. Some lung cancers produce abnormally high blood levels of certain hormones or substances, such as calcium. If a person shows such evidence and no other cause is apparent, a doctor...

    Read the Understanding Lung Cancer -- Diagnosis and Treatment article > >

    A few people get lung cancer after being exposed to other harmful substances, including asbestos, radioactive dust, radon, or radiation such as X-rays.

    Cancer also may be caused by gene changes (mutations) that occur as you get older.

    WebMD Medical Reference from Healthwise

    Last Updated: November 14, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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