Lung cancer is one of the most common types of cancer in the world. There are three main types of lung cancer: non-small cell lung cancer, small cell lung cancer, and carcinoid lung cancer. Just like any other cancer, lung cancer is dangerous and a deadly problem. Many studies and research have been presented to find a cure, but an exact cure is yet to be found. However, there are multiple causes, ways to diagnose, and treatments for lung cancer. When you think of lung cancer, you think of smoking, it is the most common cause of cancer, but there are many other causes that people don't think about. You don't have to be a smoker to develop lung cancer, secondhand smoke, radon, diesel exhaust, air pollution and even some genetic changes cause lung cancer. Genes that help a cell grow, divide, or stay alive are called oncogenes. Genes that slow cell division or cause death when they should are called tumor suppressor genes. Cancer can be caused by the activation of these oncogenes or even when these tumor suppressor genes decide to turn off. Most genes that cause lung cancer develop over a lifetime; Inherited genes rarely play a major role in lung cancer. Lung cancer screening tests are recommended only for adults who have no symptoms but who may be at high risk of developing lung cancer. There are three things you should ask yourself before undergoing lung cancer screening, have you smoked in the last 15 years? Were you or are you a heavy smoker? Are you 55-80 years old? There are three risks to taking screening tests. The first is that you can tell someone has lung cancer when no cancer is present, which can lead to unnecessary tests and surgeries. This is called a false positive result... middle of paper ......patients are diagnosed at an advanced stage when any curative treatment method is not possible. Lung cancer is dangerous: it claims more lives every year than breast, colon and prostate cancer combined. Lung cancer is more difficult to treat than these other types of cancer. The latest I learned is that each year in the United States, approximately 200,000 people are diagnosed with lung cancer and more than 159,000 die from the disease. Lung cancer is the most common type of cancer in the world. However, it is a difficult cancer to treat, more ways and treatments are presented and studied daily. Lung cancer is a deadly disease that presents many problems in a person's life. There are ways to reduce your risk of developing cancer, but there are too many environmental factors that play a role in cancer to be sure you can positively prevent it.