14 Common Causes of High Bilirubin

2. Gilbert’s Syndrome

Gilbert’s syndrome is a common inherited condition that raises bilirubin levels in your blood by affecting how your liver processes bilirubin. Many people have it without knowing. You usually see higher bilirubin levels during stress on your body, such as skipping meals, dehydration, illness, heavy exercise, or lack of sleep.

You may notice mild yellowing of your skin or eyes when bilirubin rises, or feel tired, but many people have no symptoms at all. Your liver tests stay normal except for bilirubin. This condition does not damage your liver or lead to liver failure, cancer, or chronic liver disease.

Gilbert’s syndrome can affect how your body handles certain drugs because some drug classes rely on the same liver process that handles bilirubin. This can raise the risk of side effects in some cases. Bilirubin levels often rise and fall on their own. Eating regular meals and staying hydrated can help keep levels steady.

3. Liver Dysfunction

Your liver clears bilirubin from your blood, and when it does not work well, bilirubin can build up and cause yellowing of your skin or eyes. Liver dysfunction can happen for many reasons. Inflammation or long-term scarring of the liver slows how bilirubin moves through your body. It also reduces how well your liver changes bilirubin into a form your body can remove.

Some people have a mild inherited condition where the liver processes bilirubin more slowly, and this leads to higher bilirubin on tests while other liver tests stay normal. Blockage in the bile ducts can also raise bilirubin levels, as these ducts carry waste from your liver to your gut, and narrowing or clogging causes bilirubin to back up into your blood.

Common signs include yellow skin or eyes, dark urine, pale stools, tiredness, and pain on the right side of your upper belly. Blood tests often measure total and direct bilirubin to help show where the problem starts, and your provider uses these results with your symptoms to understand how your liver is working.

4. Hepatitis

Hepatitis means your liver becomes swollen and irritated. As a result, bilirubin levels can rise in your blood and lead to yellow skin or eyes. You can get hepatitis from a virus, alcohol use, or your immune system attacking the liver by mistake. Viral hepatitis spreads through contaminated food, blood, or body fluids.

In hepatitis, both forms of bilirubin can rise because your liver cannot change bilirubin into a form that exits through bile. As bilirubin builds up, you may notice dark urine, pale stools, itching, or fatigue.

High bilirubin from hepatitis may appear suddenly or develop slowly, depending on how severe the liver swelling becomes and how long it lasts. Blood tests often show bilirubin rising along with other signs of liver stress.

5. Bile Duct Inflammation

Bile duct inflammation happens when the tubes that carry bile from your liver become swollen or infected, and this slows or blocks bile flow. When bile backs up, bilirubin rises in your blood and causes yellow skin or eyes. You may notice pain in the upper right side of your belly, fever, chills, dark urine, pale stools, or feel sick to your stomach or very tired.

Gallstones often trigger this condition by blocking the bile duct, and infections can also inflame the duct when bile cannot drain well. Long-term swelling may cause scarring, which makes future blockages more likely. Blood tests often show high bilirubin levels during active disease.

Doctors may use imaging tests to look for blockages or swelling, and treatment focuses on clearing the blockage and controlling infection. Care may include procedures to open the duct and supportive medical care to lower inflammation.

6. Intrahepatic Cholestasis of Pregnancy

Intrahepatic cholestasis of pregnancy develops when bile does not flow well from your liver during pregnancy. It causes bile to build up in your blood and raises bilirubin levels. You often notice intense itching without a rash, especially at night on your hands and feet, and may see dark urine, pale stools, or yellowing of the skin or eyes.

This condition usually starts in the later months of pregnancy, but it can appear earlier. Hormone changes and genetics play a role, and if you had this condition in a past pregnancy, you have a higher chance of getting it again. High bilirubin happens because bile cannot leave the liver as it should, so bilirubin stays in your bloodstream instead of moving into your gut.

Doctors monitor you closely with regular blood tests. Treatment may include a bile acid medicine to help improve bile flow and reduce itching, and antihistamine medicines may help with sleep if itching keeps you awake. Symptoms usually fade after delivery, and bilirubin levels return to normal, though you may have a higher risk of liver or gallbladder problems later in life.

7. Hemolytic Anemia

Hemolytic anemia occurs when your red blood cells break down faster than your body can replace them. As a result, more bilirubin is released as a waste product. The extra bilirubin builds up in your blood and raises your levels.

In hemolytic anemia, red blood cells break apart much sooner than their normal four-month lifespan. Your liver struggles to clear the added bilirubin, which leads to yellow skin or eyes, dark urine, or pale stools.

Several issues can trigger this condition, such as inherited red blood cells that break easily, your immune system attacking healthy red blood cells by mistake, infections, toxins, or mismatched blood transfusions. You may notice fatigue, weakness, shortness of breath, or pain or fullness on the left side of the belly due to an enlarged spleen.

Treatment focuses on the cause. Severe cases may require blood transfusions, and immune-related cases may use immune-suppressing medicines. When breakdown happens quickly, your body may need extra nutrients like iron and folate to support new blood cell growth.

8. Blood Transfusion

A blood transfusion can raise your bilirubin level when your body breaks down red blood cells faster than normal after the transfusion. Your immune system may react to the donated blood, and if the blood types do not match well, your body may destroy the donated red blood cells. This process releases bilirubin into your blood.

You may also see higher bilirubin if you receive a large amount of blood over a short time or if older stored blood breaks down more easily once in your body. Some transfusion reactions cause fever, chills, or back pain, which can signal red blood cell damage and rising bilirubin.

People with liver problems may notice this change more often because their liver already works harder to remove bilirubin. Doctors monitor you closely during and after a transfusion, and blood tests help track bilirubin and spot problems early.

9. Strenuous Exercise

Strenuous exercise can raise your bilirubin level for a short time, especially after long runs or intense workouts. When you exercise hard, your body breaks down more red blood cells, creating bilirubin as waste. Your liver usually clears it, but a sudden increase can make levels rise in your blood.

Heavy workouts strain your muscles, and this releases substances into your blood that your liver must handle. If your liver works slower during recovery, bilirubin can build up temporarily. Dehydration from sweating and not replacing fluids makes your blood more concentrated, which can make lab tests show higher bilirubin. You may notice no symptoms, or you may feel tired after exercise. Some people see mild yellowing in the eyes during peak training periods. Levels often return to normal after rest, fluids, and lighter activity.

10. Drug Abuse

Drug abuse can raise your bilirubin levels by harming how your liver works. Your liver clears bilirubin from your blood, but when drugs damage liver cells, bilirubin can build up. Substances like alcohol, stimulants, opioids, and inhaled drugs can stress the liver over time, and some drugs also slow bile flow.

Injection drug use adds another risk because shared needles can spread infections that attack the liver, which reduces its ability to process waste, including bilirubin. A sudden overdose or toxic exposure can inflame the liver and raise bilirubin quickly, even after short-term use.

You may notice dark urine, pale stools, itching, or tiredness. The skin and the whites of your eyes may turn yellow as levels increase. Mixing drugs increases harm, as using multiple substances at the same time places extra strain on your liver. Your risk depends on dose, frequency, and your liver health. If your liver already has damage, drug abuse can worsen bilirubin problems faster.

11. Certain Medications

Certain medications can raise your bilirubin level by changing how your body handles red blood cells or by slowing how your liver processes waste. This effect can appear after starting a new drug or changing a dose. Several drug classes, such as some antibiotics, anti-seizure drugs, and pain relievers, can stress the liver or affect bile flow.

Drugs that affect red blood cells may raise bilirubin by causing them to break down faster than usual. Other medications can block bile from moving out of the liver, so bilirubin builds up in your blood and causes yellowing of the skin or eyes.

You may notice no symptoms at first, but some people feel tired, notice darker urine, or see pale stools. Blood tests often find the change before symptoms appear. The risk depends on the drug class, dose, duration, age, liver health, and other conditions.

12. Cirrhosis

Cirrhosis scars your liver over time, blocks normal blood flow, and makes it harder to process bilirubin. Bilirubin builds up in your blood and causes yellowing of your skin or eyes when your liver cannot clear it well. Heavy alcohol use, long-lasting viral infections, and fatty buildup can all lead to cirrhosis by causing repeated injury to the liver.

As cirrhosis worsens, your liver loses many key jobs, such as cleaning your blood and making proteins, which makes bilirubin levels rise even more. You may notice swelling in your belly or legs, easy bruising, ongoing tiredness, itching, or sensitivity to certain medicines.

Cirrhosis also changes how blood moves through the liver, which adds extra strain to nearby blood vessels and organs. Over time, these changes affect many body systems and explain why bilirubin problems often appear in later stages.

13. Poor Diet

A poor diet can raise your bilirubin levels by putting extra strain on your liver, which needs steady fuel to work well. Eating too many processed foods and added sugars leads to fat buildup in the liver and interferes with how your body handles old red blood cells. Very low calorie diets or frequent fasting break down more red blood cells for energy, which raises bilirubin faster than your liver can remove it.

Poor hydration keeps waste products in your body longer, which causes bilirubin to rise. Diet choices often play a role as well. Diet patterns linked to higher bilirubin include low intake of fruits and vegetables and high intake of fried or sugary foods. Other patterns include not eating enough protein and skipping meals often. You may not notice symptoms right away, but over time, poor diet choices can weaken liver function and make bilirubin problems more likely.

14. Gallbladder Disease

Your gallbladder stores bile, a fluid made by the liver that helps move bilirubin out of the body. Gallbladder disease affects how well bile moves through the bile ducts. When bile flow slows or becomes blocked, bilirubin can build up in your blood and lead to yellowing of the skin or eyes.

Gallbladder disease includes problems that affect the structure or function of the gallbladder itself, such as inflammation, thickened walls, or poor emptying. These changes can narrow bile ducts or disrupt normal bile release. When bile cannot move freely, bilirubin becomes trapped and blood levels rise.

Inflammation plays a major role in many gallbladder disorders. Swelling limits bile movement and increases pressure inside the bile system. If infection is present, bilirubin levels can rise more quickly as bile flow becomes more restricted. Gallbladder disease often causes noticeable symptoms. You may feel pain on the upper right side of your abdomen, along with nausea or vomiting. Changes such as pale stools or dark urine can appear when bile drainage is reduced.