Esophagogastroduodenoscopy (EGD) 

Before esophagogastroduodenoscopy (EGD), you will be given a sedative. Your physician will thread a narrow, flexible tube called an endoscope-which has a tiny light and camera at the tip-through your mouth, esophagus and into your stomach and sometimes small intestine. He or she can then see any abnormalities and take tissue samples for laboratory analysis if desired.