Lung cancer is a growth of malignant cells in the lungs.
You see, throughout your life the cells in your body continually divide and reproduce. Believe it or not, every minute of your life this process takes place ten million times. Think about it ... ten million times a minute! Not only is that incredible, it's a demonstration of how complex your body really is.
Now, for the most part, this all takes place in an orderly manner as your cells go about doing their job of meeting the needs of your body. Occasionally, however, a cellular mutation will occur and rather than maturing and dying as it was intended to do, a cell continues reproducing. This is cancer ... the uncontrolled reproduction and growth of abnormal cells in the body.
Lung cancer is the growth of these malignant cells in the lungs.
Most often, the malignant cells are believed to form in the epithelial lining of the airways, where the oxygen is extracted from the air we breathe. This is why lung cancer 肺癌症狀背痛 is sometimes referred to as bronchogenic carcinoma (cancer arising from the bronchia). A relatively small percentage of lung cancer (10% or less) begins in the pleura, the thin tissue sac that surrounds the lungs. These cancers are called mesothelioma. The most common form of mesothelioma is linked to exposure to asbestos. The rarest form of begins in the blood vessels or other supporting tissues of the lungs.
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