1. Gastroesophageal reflux disease (GERD): the silent culprit

One of the most common causes of chronic phlegm in the throat is a condition that isn't always considered: gastroesophageal reflux disease (GERD) . This is a condition in which stomach acid flows back up into the esophagus, the tube connecting the stomach to the mouth. While many associate GERD with the classic sensation of intense heartburn, it often manifests in much more subtle, even "atypical," ways. These symptoms include persistent phlegm, a chronic dry cough, or a constant tickling sensation that makes you want to clear your throat.
So how does stomach acid cause mucus production? When this harsh acid flows back up the esophagus and irritates the delicate lining of the throat, the body goes into defense mode. It produces more mucus to form a protective barrier. In cases of chronic reflux, this mucus production spirals out of control. Even worse, the constant inflammation can damage the airways and reduce the body's ability to effectively clear mucus, leading to buildup and even infections. A vicious cycle of irritation and mucus production then begins.
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