Final answer:
Phlegm is one of the humors described by Galen in ancient Greek and Roman medical beliefs.
Explanation:
Phlegm is considered one of the humors described by Galen. The concept of humors, including phlegm, blood, black bile, and yellow bile, was believed to directly influence health and temperament according to ancient Greek and Roman physicians like Galen.
Learn more about Ancient Medical Beliefs here:
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