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Lung Cancer

What is Lung Cancer ?
Lung cancer usually occurs because some outside factor, called a carcinogen, has triggered the growth of abnormal, cancerous cells in the lung. These cancerous cells multiply out of control, and eventually form a mass called a tumor. As the tumor grows, it destroys nearby areas of the lung. Eventually, the tumor's abnormal cells can spread (metastasize) to nearby lymph nodes and to distant organs, such as the brain. In most cases, the carcinogens that trigger lung cancer are chemicals found in cigarette smoke.

Causes of Lung Cancer
Lung cancer most commonly strikes people between the ages of 55 and 65, and smokers account for 86 percent to 90 percent of all cases. Risk factors for lung cancer include:
  • Cigarette smoking
  • Passive cigarette smoking
  • Exposure to radon gas
  • Exposure to asbestos
  • Work-related exposure to substances


Symptoms of Lung Cancer
. However, most lung-cancer patients have one or more of the following symptoms:
  • Cough
  • Coughing up blood (hemoptysis)
  • Wheezing
  • Shortness of breath
  • Discomfort during breathing
  • Chest pain
  • Symptoms of pneumonia (fever and a mucus-producing cough)
  • Discomfort during swallowing
  • Hoarseness
  • Weight loss and poor appetite
  • Other symptoms, if cancer has spread to the brain, bones or elsewhere


Diagnosis of Lung Cancer
Your doctor may suspect lung cancer based on your symptoms and your history of smoking. To look for further evidence of cancer, your doctor will perform a thorough physical examination with special attention to your lungs and chest. Your doctor then will order radiologic studies such as chest X-rays and possibly a computed tomography (CT) scan to see any masses better.

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