1) Gastroesophageal reflux disease (GERD) occurs when stomach acid moves back up into the esophagus. It is usually caused by the lower esophageal sphincter not closing properly.
2) Symptoms of GERD include heartburn, sore throat, difficulty swallowing, and a sour taste in the mouth.
3) Treatment for GERD ranges from lifestyle changes like dietary modifications to medication or surgery in severe cases.