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Leonard James Wudel Dr. Himalaya E. Lele and Dr. Leonard James WudelCancer begins in cells, the building blocks that make up tissues. Normal, healthy cells grow and divide to form new cells as the body needs them. When normal cells grow old or become damaged, they die, and new cells take their place.Sometimes, this orderly process goes wrong. New cells form when the body does not need them, and old or damaged cells do not die as they should. The buildup of extra cells often forms a mass of tissue called a growth or tumor.Tumor cells can be benign (not cancer) or malignant (cancer). Benign lung tumors are rarely a threat to life, usually do not need to be removed and do not spread to other parts of the body. Malignant lung tumors may be life threatening, may grow back after being removed, and can spread to other parts of the body.Risk FactorsStudies have found the following risk factors for lung cancer:Tobacco smoke: Tobacco smoke causes most cases of lung cancer. It by far the most important risk factor for lung cancer. Harmful substances in smoke damage lung cells. The more a person is exposed to smoke, the greater the risk of lung cancer.Radon: Radon is a radioactive gas you cannot see, smell or taste. It forms in soil and rocks. People who work in mines may be exposed to radon. In some parts of the country, radon is found in houses. Radon damages lung cells, and people exposed to radon are at increased risk of lung cancer. The risk of lung cancer from radon is even higher for smokers.Asbestos and other substances: People who have certain jobs (such as those who work in the construction and chemical industries) have an increased risk of lung cancer. Exposure to asbestos, arsenic, chromium, nickel, soot, tar and other substances can cause lung cancer. The risk is highest for those with years of exposure. The risk of lung cancer from these substances is even higher for smokers.Air pollution: Air pollution may slightly increase the risk of lung cancer. The risk from air pollution is higher for smokers.Family history of lung cancer: People with a father, mother, brother or sister who had lung cancer may be at slightly increased risk of the disease, even if they don smoke.Personal history of lung cancer: People who have had lung ugg boots online cheap cancer are at increased risk of developing a second lung tumor.Age over 65: Most people are older than 65 years when diagnosed with lung cancer.People who think they may be at risk for developing lung cancer should talk to their doctor. Several methods of detecting lung cancer have been studied as possible screening tests. The methods ugg boots australia sale under study include tests of sputum (mucus brought up from the lungs by coughing), chest x rays or CT scans.However, screening tests have risks. For example, an abnormal x ray result could lead to other procedures, but a person with an abnormal test result might not have lung cancer. But as the cancer grows, common symptoms may include:a cough that gets worse or does not go away breathing trouble, such as shortness of breath constant chest pain coughing up blood a hoarse voice frequent lung infections, such as pneumonia feeling very tired all the time weight loss with no known cause Most often these symptoms are not due to cancer. Other health problems can cause some of these symptoms. Your doctor may ask about your personal ugg boot online and family medical history. Your doctor may order blood tests, and you may have one or more of the following tests:Physical exam: Your doctor checks for general signs of health, listens to your breathing, and checks for fluid in the lungs.