An endoscopy is a medical procedure that allows doctors to look inside a patient's body using a thin, flexible tube called an endoscope. This tube has a light and a camera at the end, which helps doctors see areas like the stomach, intestines, or lungs. Endoscopies are often used to diagnose problems, take biopsies, or even treat certain conditions without needing major surgery. During an endoscopy, patients may receive a sedative to help them relax. The procedure is usually quick and minimally invasive, meaning it involves small incisions or none at all. After the endoscopy, patients can often go home the same day and resume normal activities shortly after, depending on their doctor's advice.