The backwards flow (reflux) of acid from stomach upwards into the esophagus and even farther up, to the level of the laryngopharynx. Symptoms may be esophageal, laryngopharyngeal, or both. Esophageal symptoms include heartburn, indigestion, acid belching. Laryngopharynx symptoms tend to include dry throat, husky (especially morning) voice, frequent morning throat clearing, excessive mucus, mildly sore throat.
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