Endoscopic Retrograde Cholangiopancreatography (ERCP) is a minimally invasive procedure used to diagnose and treat problems of the pancreas and bile ducts. It involves the insertion of a long, thin, flexible tube called an endoscope into the mouth, down the throat, and through the stomach and into the small intestine. Once the endoscope is in place, a small amount of contrast material is injected into the bile ducts and pancreatic ducts. As the contrast material passes through these ducts, X-ray images are taken so that any abnormalities can be seen. This includes blockages, tumors, stones, or even narrowing of the ducts. The doctor can then take action depending on what is seen. For example, if a blockage is seen, a stent can be placed to open it up. If a tumor is present, biopsy samples can be taken for further testing. In addition to diagnosing problems, ERCP can also be used to treat them. For example, if the bile ducts are blocked by a stone, the doctor can use a special device to break it up into small pieces and then remove them from the body. This relieves the obstruction, allowing the bile to flow freely again. ERCP is a highly effective procedure that can help diagnose and treat many problems of the digestive tract. It is safe and minimally invasive, with minimal risk of complications. However, it should only be performed by a qualified doctor, as incorrect or inappropriate use of the procedure can lead to serious complications.