Of all the causes of lung cancer 90% of the times smoking is the main reason. Apart from that passive smoking, pollution, radon gas etc can be a cause of lung cancer. Excessive exposure to asbestos is also known to cause lung cancer.

Lung cancer is the disease in which the cells grow abnormally into the normal tissue of the lungs and they start forming a tumor of abnormal cells

The symptoms can be • A persistent cough or wheezing • Recurring bronchitis or pneumonia • Pain or weakness in a shoulder or arm • Weight loss • Chest pain • Shortness of breath • Constant fatigue • Loss of appetite • Coughing up blood • Hoarseness • Swelling of the neck and face • Streaks of blood in the sputum • A sharp decrease in blood sodium level

Cigarette smoking is the main reason for lungs cancer. Also, 90% of lung cancer cases are due to tobacco. Other reasons are passive smoking, pollution, exposure to asbestos and radon gas.

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In the final stage, the lung cancer cells spread to both the lungs and sometimes in the vital organs like kidney, brain, bones liver etc. As per the situation of cancer and the extent to which it has already affected the body. Different things can be observed like breathing problem which can be due to fluid in the lungs. The patient may experience comma.