Bilirubin is a yellow pigment formed from red blood cell breakdown and excreted in bile. High bilirubin levels in adults may indicate liver, bile duct, or blood problems, while in newborns they may cause jaundice and neurological complications. This article defines bilirubin and examines the causes of elevated bilirubin levels in adults and newborns. It also looks at the symptoms and treatment options for high bilirubin levels. Bilirubin is an orange-yellow bile pigment formed during the normal breakdown of the red blood cells. Learn about the elevated bilirubin level and its problems. Learn what is a dangerous level of bilirubin in adults, its causes, symptoms, and treatment options in this complete health guide.