A cough is a sudden expulsion of air from the lungs. Its purpose is usually to clear secretions and inhaled foreign substances from the lungs and respiratory tract. There are different types of cough:
  • Acute cough—lasts for less than 3 weeks
  • Subacute cough—lasts 3-8 weeks
  • Chronic cough—lasts longer than 8 weeks


An acute cough is usually caused by an infection, such as a cold or the flu. In some cases, an acute cough can be the sign of other conditions, such as: Subacute cough is often a cough that follows a respiratory infection. It can also be caused by exposure to irritants or to anything that can cause chronic cough. A chronic cough has many causes. Common examples include:
Alveoli (Air Sacs) of Lung
Chronic Bronchitis
Copyright © Nucleus Medical Media, Inc.

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