Can you explain what an endoscopy is?

Scoping you out! Endoscopy is a general term meaning inserting a lighted scope into you somewhere, usually further specified by a prefix like colonoscopy, ureteroscopy, laryngoscopy which basically says where it goes. Often the docor can not only look inside but also biopsy (take tissue) and do other tests while in there--may require sedation depending on how far in they go!
Endoscopy. Endoscopy involves visualizing internal organs using a flexible tube. The tube is long and has a light source and camera to record pictures and visualize organs. In upper endoscopy, the scope is introduced through mouth and esophagus, stomach and small bowel is evaluated. In lower endoscopy, the colon and rectum ate evaluated.