Body Substance
phlegm Audio
phlegm [ flem ]
Definitions related to phlegm:
  • A more than normal amount of thick mucus made by the cells lining the upper airways and lungs. A buildup of phlegm may be caused by infection, irritation, or chronic lung disease, and can cause discomfort in the chest and coughing.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • A viscous body substance produced by the mucous membranes of the respiratory system.
    NCI
    U.S. National Cancer Institute, 2021
  • Thick, sticky mucus secreted by mucous membranes, such as the sinuses.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.