What are the common causes of pathological jaundice in newborns?
First, hemolytic disease of the newborn (HDN), caused by blood group incompatibility between mother and fetus.
Second, intrauterine or postnatal infection—jaundice resulting from hepatocellular dysfunction due to viral or bacterial infection, such as sepsis or neonatal hepatitis syndrome.

Third, perinatal factors—jaundice resulting from birth trauma, hypoxia-ischemia, or other perinatal insults.
Fourth, intrahepatic bile duct or biliary tract obstruction—often secondary to inflammation or congenital biliary malformations.
Fifth, breast milk jaundice—a distinct type of pathological jaundice associated with breastfeeding.

Additionally, less common causes of pathological jaundice include drug-induced jaundice, various enzymatic deficiencies (e.g., glucose-6-phosphate dehydrogenase deficiency), hereditary spherocytosis, galactosemia, and other inherited metabolic disorders.