What is bile duct cancer and what are its symptoms?

Bile duct cancer, also known as cholangiocarcinoma, is a rare disease in which malignant (cancer) cells form in bile ducts. Bile ducts are a series of thin tubes that go from the liver to the small intestine. Its symptoms include itchy skin, darker urine and paler poop than usual, loss of appetite, stomach pain and whites of eyes turning yellow.