1. Acid reflux
The most popular yet often undiagnosed cause of excess mucus is acid reflux. This happens when the valve at the top of the stomach doesn’t close properly, allowing stomach acid to back up into the esophagus and into the throat. This acid reflux may be followed by heartburn, but in many cases, only the symptoms connected to the mucus appear, a condition called silent reflux or gastrolaryngeal reflux disease (GLR).
