Hi @jennifermims, welcome to Mayo Clinic Connect. I added your question to the Lung Health group as well as the Digestive Health group. Mucus is produced by the gastrointestinal tract (gut) but also the upper respiratory tract (nose, mouth, and throat) and the lungs and nearby lower respiratory tract airways. Mucus from the lungs is often referred to a phlegm and plays a crucial role in preventing germs and materials from entering the airways and lungs and potentially causing an infection.

Do you have lung issues? Have you explored pulmonary causes or is it clear that this is a digestive tract issue? Does certain activities or foods increase the amount of sputum?