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Cancer is not one disease, there are many types of cancer, and we actually have over 100 types of cancer that scientists discovered, what is cancer? Cancer means the uncontrolled growth of abnormal cells called tumors. There are two forms of tumors: the beginning tumors are not cancerous, the other cancerous tumors, this type invade our normal tissues and disrupt our body function. We agree that cancer is danger disease but if we adopt the right therapy we can get well of it. The major kinds of cancer are lung cancer, breast cancer, prostate cancer, colon cancer. In this paper, i will talk about one kind of these cancers: the lung cancer. I treat of its causes, its symptoms, its types of therapy and the new medical technology used in this case. What is lung cancer? Lung cancer is the controlled growth of abnormal cells in the lung. Lung cancer develops when the genetic material responsible for production of lung cells is damaged when those cells formed tumors that block air passages in the lung and make it stop functioning as it should. Researchers have discovered that there are certain genes that are not replicated in the lung cells of smokers. It’s known as gene deletion. It’s especially prevalent in youth smokers.