Phlegm, or mucus, is often one of the most common medical conditions that can be triggered by simple allergens, dust or bacterial and viral infections. Mucus is a thick fluid, formed when the body is fighting off any foreign material or organism.

Phlegm, or mucus, is often one of the most common medical conditions that can be triggered by simple allergens, dust or bacterial and viral infections. Mucus is a thick fluid, formed when the body is fighting off any foreign material or organism.

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