Hi.. Hemoglobin in the blood gets hemolysed and is metobolised to bilirubin in the liver which is then secreted into the intestines through the gall bladder and its duct... Obstruction in these duct leads to accumulation of bilirubin which causes jaundice.. This is referred to obstructive jaundice.. The cause for the obstruction could be a stone or any other structural problems in this biliary/gall bladder duct which could be detected by means of a scan or an imaging technique (CT or MRI scan).. And the treatment part, you know..