The post-nasal drip is a common yet often unfamiliar problem that can cause significant discomfort. This phenomenon is frequently intertwined with chronic cough, and many only become aware of it when their doctor provides a diagnosis. There are numerous causes behind post-nasal drip, including respiratory infections, allergic reactions, and environmental factors. The health role of mucous membranes is essential, as they help protect the airways from pathogens and pollutants. The Role of Mucous Membranes The mucous membranes of the airways continuously produce mucus, which serves a protective function. Pollutants and allergens present in the inhaled air adhere to the mucus, which is then removed with the help of cilia. This…