Mayo Clinic Lung Cancer

"Lung cancer is the leading cause of cancer deaths in the United States, among both men and women. It claims more lives than colon, prostate, lymph and breast cancer combined. Yet most of these lung cancer deaths could have been prevented. That's because smoking accounts for nearly 90 percent of lung cancer cases. … Because lung cancer doesn't cause signs or symptoms in its earliest stages, it's often advanced by the time it's diagnosed. When symptoms do occur, the most common warning sign is a cough, which occurs when a tumor irritates the lining of the airways or blocks the passage of air. In addition to a new cough, be alert for: • "Smoker's cough" that worsens • Coughing up blood, even a small amount • Chest pain • Shortness of breath • New onset of wheezing • Repeated bouts of pneumonia or bronchitis • Hoarseness that lasts more than two weeks Lung cancer also may cause fatigue, loss of appetite and weight loss. If it has spread to other parts of your body (metastasized), you may have headaches or bone pain."

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CancerHelp UK - Types of lung cancer

"There are important differences between lung cancer that started in the lungs and lung cancer that has spread to the lung from another part of the body. … Primary lung cancer (cancer that has started in the lungs) There are several different types of primary lung cancer. These are divided into two main types • Small cell lung cancer • Non-small cell lung cancer ... Secondary lung cancer (cancer that has spread to the lungs) Secondary cancer is cancer that has spread from somewhere else in the body. There are quite a few different cancers that can spread to the lungs, including breast cancer and bowel cancer."