Lung Cancer Information - Symptom, Stages and Lung Cancer Prognosis

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Most lung cancer starts in the cells lining the main air passages, or bronchi. In their cancerous state, these cells lack cilia which are tiny hair like substances that normally catch and remove foreign particles inhaled into the lungs. 

Mucous in the lungs which is usually cleared by bronchial cilia then becomes trapped, blocking air passages and causing respiratory problems.
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Lung cancer symptom are not usually obvious during early stages of the disease because the first symptoms to appear are frequently comparable to those of other, non-malignant respiratory illnesses. Lung cancer accounts for the largest percentage of cancer deaths in the western world and it has been proved many times over that cigarette smoking is directly responsible for most of those cases.
Asbestos can also cause a variety of lung diseases. It increases the risk of developing asbestos lung cancer (or mesothelioma lung cancer, which is cancer of the pleura). There is a synergistic effect between tobacco smoking and asbestos in the formation of lung cancer. The condition is further aggravated by smoking.
Cancer that originates in the cells of the lungs is called primary lung cancer; however, it may also spread (metastasize) to the lung from other parts of the body. Metastatic lung cancer originated most commonly from the breast, colon, prostate, kidney, thyroid gland, stomach, cervix, bone, or skin. Metastatic cancer to the lung is a sign that the cancer has spread into the bloodstream. Usually cancer will be present even in places not seen by CT scans. In these circumstances, removing the visible tumors by surgery is usually not beneficial.