Jaundice: A comprehensive review of causes, diagnosis, and treatment strategies

Jaundice, or hyperbilirubinemia, is characterized by a yellow discoloration of the skin, sclerae, and mucous membranes due to excess bilirubin in the bloodstream. This condition can occur due to various factors, such as increased production of bilirubin, impaired hepatic conjugation, or reduced excretion of bilirubin. Clinically, jaundice is most visible when serum bilirubin levels exceed 3 mg/dL, with the yellow color progressing to a green hue in prolonged cases due to biliverdin accumulation. It serves as a key indicator of liver dysfunction, though it can also arise from other systemic conditions.

The causes of jaundice are categorized based on the phase of bilirubin metabolism: prehepatic (e.g., hemolysis), hepatic (e.g., viral hepatitis, alcoholic cirrhosis, and drug-induced liver injury), and posthepatic (e.g., biliary obstruction from gallstones or tumors). Diagnostic evaluation involves a thorough history and physical examination, followed by liver function tests to determine whether the jaundice is due to hepatocellular, cholestatic, or mixed causes. Additional imaging studies, such as ultrasound or magnetic resonance cholangiopancreatography (MRCP), may be necessary to identify obstructions in the bile ducts.

Management of jaundice is centered around treating the underlying cause. In cases of biliary obstruction, surgical or endoscopic interventions may be required. Hepatocellular causes, such as hepatitis, are treated with antiviral therapies or lifestyle modifications, while supportive care, including phototherapy, is often used for newborns with neonatal jaundice. Early diagnosis and intervention are critical to prevent complications like kernicterus in infants or chronic liver failure in adults.