The endoscopic ultrasound (EUS) procedure examines the inside of your digestive tract. You can use it to detect pancreatic cancer, colon cancer, and cancer that has spread to other parts of your body. Pancreatitis, inflammatory bowel disease (IBD), pancreatitis, and other causes of abdominal pain can also be detected with EUS. A EUS procedure can assess damage to tissues following disease or inflammation, determine the spread of cancer, discern how advanced cancer is, drain fluids from cysts, and more.