How do people know if they have lung cancer?

Lung cancer often doesn't cause any signs or symptoms in its early stages. As the cancer grows, it may cause signs and symptoms such as:

Persistent cough A cough that lasts for more than two weeks or changes character should be evaluated by a doctor, especially for those over age 50 or who smoke or have a history of smoking.

Chest pain Pain in the chest that is constant or worsens with coughing, deep breathing or laughing.

Hoarseness A voice change or hoarseness that doesn't go away.

Shortness of breath Difficulty breathing or shortness of breath.

Wheezing A whistling sound when you breathe.

Fatigue Feeling tired or weak all the time.

Weight loss Unexplained weight loss of 10 pounds or more.

Bone pain Pain in your bones, such as your back or hips.

Headaches Headaches that don't go away or are worse in the morning.

Swollen lymph nodes Enlarged glands in your neck, under your arm or in your chest.

Nail changes Clubbing, or widening and rounding of the tips of the fingers or toes.

If you have any of these signs and symptoms, it doesn't necessarily mean you have lung cancer, but it's important to see your doctor for evaluation.

Who is most at risk for lung cancer?

The risk of lung cancer increases with age, and most people who get lung cancer are over the age of 65. Cigarette smoking is the leading risk factor for lung cancer, but other risk factors include:

* Exposure to secondhand smoke

* Exposure to asbestos, radon, or other cancer-causing substances

* A family history of lung cancer

* Chronic obstructive pulmonary disease (COPD)

* A weakened immune system

If you have any of these risk factors, it's important to talk to your doctor about ways to reduce your risk of lung cancer.