An endoscopy allows the doctor to view the inside of your upper digestive system. This outpatient procedure can be used to diagnose gastroesophageal reflux disease (GERD) or to find the cause of symptoms such as difficulty swallowing, abdominal pain, and gastrointestinal bleeding. At our state-of-the-art center in Queens, NY, we safely perform endoscopy to reveal conditions such as gastrointestinal diseases that require further treatment.