Jaundice is caused by high levels of bilirubin in the blood, which leads to yellowing of the skin and eyes. Bilirubin is produced from the breakdown of red blood cells and is normally processed by the liver and gallbladder. Common causes of jaundice include hepatitis, gallstones, and tumors, which can interfere with bilirubin processing or cause liver inflammation. Signs of jaundice include yellow skin and eyes, as well as potentially itchy skin, weight loss, abdominal pain, and joint inflammation depending on the underlying cause.