What Causes Black Pigment Gallstones?

Calculi (stones) are solid, mass-like formations that develop within the lumens of ducts or hollow organs in humans or animals, primarily composed of inorganic salts and organic substances. What causes black gallstones? The following section addresses this question.

What Causes Black Gallstones?

Black gallstones reported by patients are most commonly pigment stones. These typically arise due to elevated levels of bile pigments (e.g., bilirubin) in bile, leading to the formation of pigment stones within the gallbladder, intrahepatic or extrahepatic bile ducts, or the common bile duct. Such stones tend to be relatively hard. In contrast, some patients may develop cholesterol stones—typically yellowish-brown and softer—in the gallbladder or common bile duct.

For patients with gallbladder stones, laparoscopic cholecystectomy should be considered if the stone diameter exceeds 3 cm or if gallstones are accompanied by chronic cholecystitis with recurrent episodes lasting over six months. For patients with common bile duct stones, endoscopic retrograde cholangiopancreatography (ERCP) with stone extraction is indicated when stones cause obstructive jaundice or present with clinical symptoms such as abdominal pain, jaundice, fever, and chills.

The above outlines the causes of black gallstones. We hope this information is helpful to you.