Bile Duct Obstruction

Bile duct obstruction describes a blockage in the tubes that carry bile from the liver to the small intestine. Bile is a digestive fluid made continuously by the liver, and when its normal flow is interrupted, it can build up in the liver and spill into the bloodstream. This may happen suddenly or develop gradually, and the underlying cause can range from inflammation or infection to growths, stones, or structural changes in the ducts themselves. Owners most commonly notice a yellow tinge to the gums, skin, or the whites of the eyes—a sign that bile pigment is circulating in the blood rather than leaving the body as it should. Appetite may decline, and some animals become quieter or show discomfort in the abdomen. Urine can darken, and stools may become pale or clay-coloured when bile is no longer reaching the intestine. This page explores the patterns that may signal bile duct obstruction, what is happening inside the body when flow is interrupted, the imaging and laboratory tools used to investigate the ducts and liver, and the range of approaches—medical and surgical—that may be considered depending on the nature and location of the blockage.