Does phlegm protect the lungs from viruses?

Yes, phlegm plays a protective role in the lungs by trapping viruses, bacteria, and other harmful particles. This mucus helps to prevent these pathogens from penetrating deeper into the respiratory system. Additionally, phlegm contains antibodies and enzymes that can neutralize some of these invaders, aiding the immune response. Ultimately, while phlegm is a defense mechanism, excessive production can also indicate an underlying infection or irritation.