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Laryngopharyngeal Reflux (LPR) refers to the backflow of stomach acid into the larynx (the voice box) or the pharynx (the throat). LPR can occur day or night, but is most common at night when lying down. Because the tissues of the voice box and throat are very sensitive to injury and irritation from stomach acid, problems can occur if even small amounts of refluxed material reach into the throat.
Many people with LPR don't have heartburn... Why is that?
Not everyone with reflux has a lot of heartburn or indigestion. In fact, many people with LPR never have heartburn. This is because the material that refluxes does not stay in the esophagus for long enough to irritate the esophagus and cause heartburn. Consequently, this is why LPR is called Silent Reflux. Because LPR is silent, it can be difficult for patients to know this that they are having reflux.