The mucosal membranes that cover our skin, sinuses, airways, digestive tracts and many other tissues are critical to our health. Not only do they help protect our bodies from intruders and environmental toxins: They also provide many other critical functions including enabling us to digest our foods and allowing us to breathe. As a result, faulty or damaged mucosal membranes provide the root for many serious health conditions, including allergies, asthma, COPD, GERD and others. The author illustrates the science behind our mucosal membranes with clarity: how they are involved in disease, how they can become damaged, and what we can do to repair them and keep them healthy.