Biliary obstruction occurs when the bile ducts, which transport bile from the liver to the small intestine, become blocked. This blockage can be caused by various factors, including gallstones, tumors, or inflammation. When bile cannot flow properly, it can lead to a buildup of bile in the liver, causing jaundice and other complications. Symptoms of biliary obstruction may include abdominal pain, dark urine, and pale stools. Diagnosis typically involves imaging tests such as ultrasound or CT scans. Treatment options depend on the cause of the obstruction and may include endoscopic procedures, surgery, or medication to relieve symptoms.