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Lung cancer is the uncontrollable growth of abnormal cells in one or both lungs of the human body. These abnormal cells have the ability to form tumors and interfere with the functioning of the lung, which supplies oxygen to the entire body via the blood. Majorly, lung cancer is caused due to excess smoking or inhaling of toxic substances on a regular basis.
There are two main types of lung cancer:
Smoking is known to be the major cause of lung cancers — both in smokers and in people exposed to passive smoking. But lung cancer also occurs in people who never smoked and in those who never had prolonged exposure to secondhand smoke. In such cases, there may not be any clear causes of lung cancer.
Signs and symptoms of lung cancer generally include the following:
There is no such way of preventing lung cancer. However, the risk can be reduced if you: