of the mucous membranes. It also causes ulcers (small sores) that can bleed and produce pus that appears as rectal discharge.

One of the main protections is the mucus layer that covers the intestinal wall. Normally, this mucus is impermeable to ...

View Full Profile. Learn about our Editorial Policies. Mucus is more than just the sticky snot that comes from your nose. This protein-rich goop is found in many other organs, including the lungs and ...