• Chronic cough
• Hoarseness
• Coughing up blood
• Weight loss & loss of appetite
• Shortness of breath
• Fever without a known reason
• Wheezing
• Repeated bouts of bronchitis or pneumonia
• Chest pain

These conditions are also symptomatic of many other lung problems, so a person who has any of these symptoms should see a doctor to find out the cause. When a person goes for an exam, the doctor ask many questions about the person's medical history, including questions about the patient's exposure to hazardous substances. The doctor will also give the patient a physical exam. If the patient has a cough that produces a sputum (mucus), it may be examined for cancer cells. The doctor will order a chest X-ray or specialized X-ray such as the CT scan, which help to locate any abnormal spots in the lungs. The doctor may insert a small tube called a bronchoscope through the nose or mouth and down the throat, to look inside the airways and lungs and take a sample, or biopsy, of the tumor. This is just one of several ways in which a doctor may take a biopsy sample.

A growing number of doctors are using a form of CT scan in smokers to spot small lung cancers, which are more likely than large tumors to be cured. The technique, called helical low-dose CT scan, is much more sensitive than a regular X-ray and can detect tumors when they are small.

More studies on this type of screening will show whether routine screening of smokers and others at risk for lung cancer will save lives.

If you are diagnosed with cancer, the doctor will do testing to find out whether the cancer has spread, and, if so, to which parts of the body. This information will help the doctor plan the most effective treatment. Tests to find out whether the cancer has spread can include a CT scan, an MRI, or a bone scan.