What is jaundice

Medical Definition

Jaundice is a clinical sign characterized by the yellowing of skin, sclera (white portion of the eyes), and mucous membranes due to elevated bilirubin levels in the bloodstream. Bilirubin is a yellow-orange pigment produced when hemoglobin from old red blood cells breaks down. Normally, the liver processes and excretes bilirubin through bile. When this process fails or becomes overwhelmed, bilirubin accumulates to visible levels, producing jaundice's distinctive appearance.

Causes and Underlying Conditions

Jaundice results from three primary categories of problems. Prehepatic causes involve excessive red blood cell destruction, such as hemolytic anemia or malaria. Hepatic causes involve liver dysfunction from hepatitis, cirrhosis, or fatty liver disease. Posthepatic causes involve bile duct obstruction from gallstones, tumors, or pancreatitis. Each category requires different diagnostic approaches and treatments.

Neonatal Jaundice

Jaundice frequently affects newborns in their first week of life, occurring in approximately 60% of full-term and 80% of premature infants. Newborn jaundice typically results from the infant's immature liver and shorter red blood cell lifespan. Most cases resolve naturally as liver function matures, though severe cases require phototherapy (exposure to special blue light) or, rarely, exchange transfusion to prevent dangerous bilirubin levels that could cause permanent brain damage.

Symptoms and Diagnosis

Beyond visible yellowing of skin and eyes, jaundice symptoms may include fatigue, abdominal pain, weight loss, and changes in urine and stool color. Dark urine (tea-colored) and pale stools result from altered bilirubin metabolism and excretion. Diagnosis involves blood tests measuring bilirubin levels, liver function tests, and imaging studies. Ultrasound or CT scans help identify obstruction or structural problems.

Treatment Approaches

Treatment depends entirely on underlying cause. Newborn jaundice may resolve spontaneously or require phototherapy and monitoring. Jaundice from hemolytic anemia requires treating the underlying condition. Gallstone obstruction may require surgical removal, while infectious hepatitis may resolve with supportive care. Medical evaluation is essential to identify the specific cause and determine appropriate treatment, as some underlying conditions carry serious health implications if untreated.