During gastroesophageal reflux, the contents of the stomach and upper digestive tract may reflux all the way up the esophagus, beyond the upper esophageal sphincter (a ring of muscle at the top of the esophagus), and into the back of the throat and voice box. This is known as laryngopharyngeal reflux (LPR), which can affect anyone. Symptoms will also include hoarseness swelling of the throat.