Lung cancer is the leading cause of cancer death and the second most common cancer among both men and women in the United States, according to the American Cancer Society . At very early stages, lung cancer may not exhibit symptoms. When symptoms do occur, they may include a cough that does not go away, coughing up blood, chest pain, loss of appetite, weight loss, fatigue, shortness of breath, wheezing, or respiratory infections, such as bronchitis, that recur or do not go away. When lung cancer spreads...