The stomach secretes acid to digest the food ingested. The valve system existing to prevent contents of the stomach and gastric fluid from getting out of the stomach tries to prevent gastric fluid from leaking out of the stomach. When the valve between the stomach and esophagus doesn't function properly, acidic contents of the stomach escape into the esophagus. When the valve between esophagus and the throat doesn't function properly, contents of the stomach reach up to the throat and larynx, i.e. vocal chords, which are more sensitive to acid , stomach contents and bile. This condition is called a reflux.
This is different from the reflux commonly known as gastric reflux. Throat reflux is more during the day and while standing, whereas gastric reflux is more frequent and irritating while lying. Sensitive structure of larynx and pharynx tissues and certain nerve reflexes as well as the movements of the esophagus have an important role in development of LFR.
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