Lung Cancer is cancer that originates in an individual's lungs. Air is breathed in through an individual's nose, down the trachea (your windpipe), and into your lungs through tubes called brochi. Lung cancer usually starts off in cells lining the brochi. In cases where the cancer started off in another part of the body but spread to the lungs, the cancer is called metastatic cancer to the lungs.
The leading cause for lung cancer is smoking cigarettes. People who have never smoked in their lives however can also develop lung cancer due to secondhand smoke, exposure to cancer-causing chemicals, exposure to high levels of pollution, radiation to the lungs, and a family history of lung cancer.
Symptoms vary from person to person but some common symptoms include:
Loss of appetite
Coughing up blood
Shortness of breath