Sputum is a thick fluid that is produced in the lungs and in the airways that lead to the lungs. Sputum is different than saliva.
A person who has an infection or disease of the respiratory system may cough up sputum. Some diseases can cause pus, blood, or bacteria to show up in the sputum.
| By | Healthwise Staff |
| Primary Medical Reviewer | E. Gregory Thompson, MD - Internal Medicine |
| Specialist Medical Reviewer | Robert L. Cowie, MB, FCP(SA), MD, MSc, MFOM - Pulmonology |
| Last Revised | March 7, 2011 |
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