Lung cancer is the unexpected and expansive growth of cells in the lungs that do not form healthy lung tissue. If allowed to grow uncontrolled, the cells create tumors that can cause abnormal and dangerous activity within the lungs. Lung cancer appears when there is damage to lung cell DNA. This abnormality can be caused by various problems including a natural mutation and outside factors such as smoking or inhaling noxious materials. In their initial stages, cancerous cells can still correct their mutation and avoid becoming cancerous. If natural correction is not possible, or the affected person continues the detrimental activity, the cells eventually become fully cancerous. [symptom-checker]Oncologists treat lung cancer based on whether it is primary or secondary. Primary lung cancer occurs when cells within the lungs themselves become cancerous. Secondary lung cancer occurs when the cancerous cells formed in another part of the body and traveled to the lungs. Contrary to popular belief, lung cancer does not always have an identifiable origin. While it is a disease that strikes smokers and people who work in chemical plants or coal mines, it can also occur without warning or provocation. If you experience the symptoms of lung cancer, see a doctor immediately.
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