During an endoscopic procedure, the patient is consciously sedated using a combination of drugs. An Anesthesiologist is not necessary for routine colonoscopies or EGDs (upper GI endoscopies). The patient may or may not be awake during the course of the procedure, and frequently upon recovery the patient has no memory of what happened during their procedure. Common sensations are bloating, pressure and cramping as the colon is expanded with air as the endoscope is passed through the colon. However, with the use of an Anesthesiologist, patients usually are sedated throughout the entire procedure and therefore have fewer symptoms.