Jaundice is a yellowing of the skin and the whites of the eyes caused by a buildup of bilirubin, a yellow pigment produced when your body breaks down old red blood cells. In healthy adults, total bilirubin levels stay below about 1.2 mg/dL. When levels rise above that, the pigment starts depositing in tissues, giving skin and eyes a visible yellow tint.
Jaundice isn’t a disease on its own. It’s a visible signal that something in the chain of bilirubin production, processing, or excretion has gone wrong. The underlying cause can range from completely harmless to life-threatening, which is why understanding the different types matters.
How Bilirubin Builds Up
Your body produces about 4 milligrams of bilirubin per kilogram of body weight every day. Roughly 80% of that comes from the breakdown of hemoglobin in aging red blood cells. The rest comes from the turnover of other blood-related proteins in your muscles and throughout your body.
Fresh bilirubin doesn’t dissolve in water. To travel through your bloodstream, it hitches a ride on a protein called albumin, which carries it to the liver. Once inside a liver cell, the bilirubin gets chemically modified (conjugated) so it becomes water-soluble. The liver then pumps this processed bilirubin into bile, which flows into the intestines. Gut bacteria break it down further into compounds that give stool its brown color and urine its yellow tinge.
Jaundice happens when any step in this process breaks down: too much bilirubin being produced, the liver failing to process it, or a physical blockage preventing bile from draining. Each scenario points to a different set of causes.
The Three Types of Jaundice
Pre-Hepatic (Before the Liver)
When red blood cells are destroyed faster than normal, the liver gets overwhelmed with bilirubin it can’t process quickly enough. This leads to a buildup of unconjugated (unprocessed) bilirubin. The most common cause is hemolytic anemia, a condition where red blood cells break apart prematurely. A genetic condition called Gilbert’s syndrome also falls into this category. It affects how efficiently the liver processes bilirubin, but it’s harmless and usually discovered by accident on a routine blood test. It requires no treatment.
Hepatocellular (Inside the Liver)
When liver cells themselves are damaged or diseased, they lose the ability to process bilirubin normally. At the same time, scarring inside the liver can compress the small bile ducts, partially blocking drainage. The result is a mix of both processed and unprocessed bilirubin backing up into the blood. Common causes include viral hepatitis, alcohol-related liver disease, certain medications, and liver cancer.
Post-Hepatic (After the Liver)
Sometimes the liver does its job fine, but the bile carrying processed bilirubin can’t reach the intestines because something is physically blocking the drainage system. Gallstones are the most common culprit worldwide. Tumors of the pancreas, bile duct, or gallbladder can also compress or invade the ducts. Because the liver already processed the bilirubin before the blockage occurred, this type produces a buildup of conjugated (water-soluble) bilirubin, which can spill into urine and turn it noticeably dark.
Symptoms Beyond Yellow Skin
The hallmark signs are yellowed skin and eyes, but jaundice often comes with other symptoms that vary by type. Post-hepatic (obstructive) jaundice tends to produce pale or clay-colored stools, since the pigments that normally color stool can’t reach the intestines. Dark urine is another classic sign, because water-soluble bilirubin gets filtered out through the kidneys instead.
Itching is one of the most bothersome symptoms, particularly in obstructive cases. The exact mechanism is still debated, but it appears that substances normally excreted in bile, possibly including bile acids and other compounds, accumulate in the blood and activate itch-sensing nerve fibers in the skin. For some people, this itching is severe enough to disrupt sleep and daily life.
Other symptoms often reflect the underlying cause rather than the jaundice itself: fatigue, abdominal pain, fever, nausea, or unexplained weight loss. Right upper abdominal pain with jaundice, for instance, often points toward gallstones or liver inflammation.
How Jaundice Is Diagnosed
A blood test measuring bilirubin levels is the starting point. The test breaks results into direct (conjugated) bilirubin and indirect (unconjugated) bilirubin. Normal direct bilirubin is around 0.3 mg/dL. By comparing the two numbers, your doctor can begin narrowing down which type of jaundice is present: mostly unconjugated suggests a pre-hepatic cause, mostly conjugated suggests a blockage, and a mixed picture suggests liver cell damage.
Liver enzyme blood tests help further. Certain patterns of elevated enzymes point toward liver cell injury, while others suggest bile duct obstruction. From there, imaging comes into play.
Abdominal ultrasound is typically the first imaging test. It’s noninvasive, widely available, and effective at detecting dilated bile ducts (a sign of obstruction) as well as gallstones and cirrhosis. When more detail is needed, a CT scan with contrast can identify the exact site and cause of a blockage with up to 96% sensitivity, and it’s particularly useful for staging cancers. An MRI with a special bile duct sequence (called MRCP) is the best noninvasive option for detecting small stones missed by other methods, and it’s preferred when a bile duct narrowing or inflammatory condition is suspected.
In cases where a blockage needs to be treated at the same time it’s diagnosed, a procedure called ERCP allows a doctor to thread a thin scope through the mouth and into the bile duct. It can remove stones in 80% to 95% of cases and place stents to relieve obstructions caused by tumors.
Jaundice in Newborns
Newborn jaundice is extremely common and usually harmless. Babies are born with a high red blood cell count, and their immature livers can’t keep up with the bilirubin produced as those extra cells break down. Mild yellowing typically appears within the first few days of life and resolves on its own within one to two weeks.
When bilirubin levels climb too high, phototherapy (placing the baby under special blue-spectrum lights) helps convert bilirubin in the skin into a form the body can excrete without liver processing. The threshold for starting phototherapy depends on the baby’s age in hours, gestational age, and the presence of risk factors like blood type incompatibility or infection.
The serious concern with newborn jaundice is a condition called kernicterus, which occurs when bilirubin levels reach approximately 25 mg/dL or higher and the pigment crosses into the brain. Early signs include extreme sleepiness, poor feeding, and weak muscle tone. As it progresses, the baby may develop a high-pitched cry, stiff or arching posture, and seizures. Kernicterus can cause permanent brain damage, but it’s rare in settings where bilirubin levels are monitored and treated promptly.
Treatment Depends on the Cause
Because jaundice is a symptom rather than a standalone condition, treatment targets whatever is causing the bilirubin to accumulate. Gallstone obstruction may be resolved by removing the stones during an ERCP or by surgery to remove the gallbladder. Tumors blocking the bile duct may require stent placement to restore bile flow, followed by surgery, chemotherapy, or radiation depending on the cancer type and stage.
For liver cell damage, treatment focuses on the underlying disease. Viral hepatitis may be treated with antiviral medications. Alcohol-related liver disease requires stopping alcohol use, which can allow significant liver recovery if caught before cirrhosis becomes advanced. Drug-induced liver injury typically improves once the offending medication is stopped.
Hemolytic anemias causing pre-hepatic jaundice are managed based on the specific blood disorder involved, ranging from supplements and lifestyle changes for mild forms to more intensive therapies for severe cases. Gilbert’s syndrome, as noted earlier, needs no treatment at all. Bilirubin levels may temporarily rise during fasting, illness, or stress, causing a faint yellowish tint, but this is not harmful.