• Shortness of breath
• Chronic cough
• A change in a chronic cough
• Pain or aching when coughing or breathing
• Coughing up blood
• Difficulty swallowing

Note: If you or someone you're caring for was or is a smoker, you'll want to bring this to the doctor's attention, even if it was a long time ago. Smoking for any period greatly increases the risk of lung cancer. Exposure to secondhand smoke and certain chemicals is also a risk factor.