Gastroesophageal reflux disease (GERD) is a digestive disorder characterized by the backward flow of stomach acid into the esophagus, often causing symptoms like heartburn, nausea, and swallowing difficulties. Common causes include obesity, pregnancy, and certain lifestyle habits, with a recommendation for those experiencing frequent symptoms to seek medical evaluation, possibly through a GI endoscopy. Dr. Vikas Singla, an experienced physician at Sir Ganga Ram Hospital, specializes in treating gastrointestinal diseases like GERD.