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Cold or Flu Illness



A cough is a natural reaction of the body to irritants in the airway. There are many possible causes of a cough: the common cold or flu, asthma, allergies, lung infections, smoke or other pollutants. In cancer patients, a cough may also be a sign that the cancer has spread, or metastasized to the lungs.

What is a cough?

A cough is a sudden, violent expulsion of air from the chest in response to an irritation in the airway. Coughing is an important way to keep your throat and airways clear. However, excessive coughing may mean you have an underlying disease or disorder.

What causes a cough?

Besides “the common cold” and flu, other common causes of coughs include:

  • Asthma
  • Allergies (hay fever)
  • Bronchitis (lung infection)
  • Emphysema (obstructive lung disease)
  • Lung cancer or metastases (cancer spread to lungs)
  • Gastric reflux or heartburn
  • Pneumonia (lung infection)
  • Pollutants
  • Smoking cigarettes or exposure to secondhand smoke


How is a cough managed?

A cough is managed by treating the underlying cause.  For example:

Why is it important to carefully monitor a cough in cancer patients?

If you have a cough, your doctor may carefully monitor you for signs of lung metastases. Metastasis is the spread of cancer from its original location to distant sites in the body.  Common locations for metastases include the bones, liver and lungs. Cancers that spread to the lungs include breast cancer, prostate cancer, gastrointestinal tumors, kidney cancer, melanoma, sarcomas, lymphomas and leukemias, germ cell tumors, and rarely ovarian cancer. A cough with bloody sputum, which is the expectoration or spitting up of blood or bloody mucus from the lungs, throat or mouth, may be a sign of lung metastases.  A new or persistent cough should be reported to your doctor.

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