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What does green, yellow, or brown phlegm mean?
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What does green, yellow, or brown phlegm mean?

Problems in the lungs can cause phlegm to change color. Green or yellow phlegm can occur with an infection, but brown phlegm might indicate bleeding in the lungs. Phlegm is a type of mucus that comes from the lungs and respiratory tract. Typically, phlegm is clear, thin, and unnoticeable. When someone has a cold or...