Source: National Institutes of Health – 
Related MedlinePlus Pages: Allergy, COPD, Chronic Bronchitis, Common Cold, Cough, Cystic Fibrosis, Sinusitis
from New Links on MedlinePlus https://newsinhealth.nih.gov/2020/08/marvels-mucus-phlegm
Marvels of Mucus and Phlegm: The Slime That Keeps You Healthy (Health Tips & Reviews)
Health & Wellness Tips Guide 