How do I know I have lung cancer?

 There are a number of common symptoms of lung cancer, including coughing up blood, chest pain, shortness of breath, hoarseness, and weight loss. However, many people with lung cancer do not experience any symptoms until the cancer is quite advanced. That's why it's important to get screened for lung cancer if you are a smoker or have been exposed to secondhand smoke. Early detection is key to successful treatment.