Endoscopy is a diagnostic method that examines the upper part of the digestive system – the stomach. An overview is done using a tiny camera at the end of a long, flexible tube. The review lasts very briefly, and is not unpleasant as it is thought and expected. Endoscopy reveals the cause of various gastro-intestinal problems, such as nausea, vomiting, feeling sick and tired, stomach pain, difficulty in swallowing food and fluids, ejection of blood, etc. Endoscopy also takes a sample of tissue to perform its testing and to remove or confirm suspicions for a particular medical condition.