Lung Cancer Diagnosis

How Do I Know If I Have Lung Cancer?

If a routine physical examination reveals swollen lymph nodes above the collarbone, a mass in the abdomen, weak breathing, abnormal sounds in the lungs, or dullness when the chest is tapped, your doctor may suspect a lung tumor. Some lung cancers produce abnormally high blood levels of certain hormones or substances such as calcium. If a person shows such evidence and no other cause is apparent, a doctor should consider lung cancer.

Once a malignant tumor begins to cause symptoms, it is usually visible on an X-ray. Occasionally a tumor that has not yet begun to cause symptoms is spotted on a chest X-ray taken for another purpose. A CT scan of the chest may be ordered for a more detailed examination.

Though examinations of mucus or lung fluid may reveal fully developed cancer cells, diagnosis is usually confirmed through a biopsy. With the patient lightly anesthetized, the doctor guides a thin, lighted tube through the nose and down the air passages to the site of the tumor, where a tiny tissue sample can be removed. If the biopsy confirms cancer, other tests will determine the type of cancer and how far it has spread. Nearby lymph nodes can be tested for cancer cells, while imaging techniques such as CT scans and bone scans can detect tumors elsewhere in the body.

Because sputum examinations and chest X-rays have not proved particularly effective in detecting small tumors characteristic of early lung cancer, annual chest X-rays for lung cancer screening are not recommended by the American Cancer Society, the National Cancer Institute, or the American College of Radiology.