- Cough is non-productive (dry cough) if there is minimal clear-white or no phlegm (sputum).
- Cough is productive (wet cough) if there is yellow, green, or brown phlegm (sputum).
General Information
- Cough is a very common symptom. It is the fifth most common reason for visits to physicians.
- Smokers may have a chronic cough, especially in the morning.
Why We Cough
A cough has two important functions:
- It serves to clear the airways of infection, mucus, foreign bodies, and other irritants.
- It protects against aspiration of oral and stomach contents.
Common Causes
- Most common cause: postnasal drip syndrome from a cold, from allergic rhinitis, or from sinusitis.
- Other common causes: asthma, bronchitis, pneumonia, gastroesophageal reflux, smoking.
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If not, see these other symptoms
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