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 symptoms such as jaundice, dark urine, and pale stools. Diagnosis of biliary obstruction typically involves imaging tests like ultrasound or CT scans to identify the cause of the blockage. Treatment options may include endoscopic procedures to remove obstructions or surgery to address underlying issues. Early detection and management are crucial to prevent complications.