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Understanding Gilbert's Syndrome: Causes, Symptoms, and Management

Jerome Albert Ecker | MD

Medically reviewed by Jerome Albert Ecker | MD, Assistant Professor of Medicine, Duke University - Durham, NC on November 19th, 2023.

Key Takeaways

  • This benign genetic condition affects 3-12% of the population and results from reduced UGT1A1 enzyme activity, causing bilirubin levels to rise 2-5 times normal ranges (typically 1.2-3.0 mg/dL).

  • Jaundice episodes are often triggered by fasting for 12+ hours, dehydration, physical stress, or viral infections—symptoms typically resolve within days once triggers are addressed.

  • The condition follows an autosomal recessive inheritance pattern, meaning both parents must carry the gene mutation, with males experiencing symptoms more frequently than females.

  • Bilirubin spikes during episodes can cause fatigue and mild abdominal discomfort, but unlike other liver conditions, liver function tests (ALT, AST) remain completely normal.

  • Phenobarbital can temporarily normalize bilirubin levels if needed for cosmetic reasons before important events, though treatment is rarely medically necessary.

Gilbert's syndrome, also known as constitutional hepatic dysfunction or familial nonhemolytic jaundice, is a common genetic disorder that affects the way your body processes bilirubin, a waste product from the breakdown of red blood cells. When you have Gilbert's syndrome, bilirubin can build up in your blood, causing your skin and eyes to appear yellow (jaundice) from time to time. Despite its alarming appearance, Gilbert's syndrome is a harmless condition that doesn't require treatment.

Causes and Risk Factors

Gilbert's syndrome is caused by a mutation in the UGT1A1 gene, which provides instructions for making a liver enzyme that helps break down and remove bilirubin from your body. This genetic mutation is inherited from both parents, meaning you need two copies of the mutated gene to develop Gilbert's syndrome. However, even if you have both genes, you may not necessarily have the condition. Gilbert's syndrome is more common in men than in women.

Understanding Gilbert's Syndrome: Causes, Symptoms, and Management

Symptoms

Most people with Gilbert's syndrome don't experience any symptoms, as they have enough of the liver enzyme to control their bilirubin levels. When bilirubin does accumulate in the blood, it causes mild jaundice, which may be intermittent, which is characterized by yellowing of the skin and whites of the eyes. Jaundice can rarely be accompanied by other symptoms, such as:

  • Nausea and diarrhea

  • Abdominal discomfort

  • Fatigue

  • Dark urine

Certain factors can trigger a rise in bilirubin levels, making jaundice more noticeable. These triggers include:

  • Stress

  • Dehydration

  • Excessive exercise

  • Infections like the flu

  • Skipping meals

  • Alcohol consumption

  • Certain medications that affect the liver

  • Cold weather exposure

  • Menstruation

  • Recovery from surgery

Diagnosis

Although people are born with Gilbert's syndrome, it may not be diagnosed until their 20s or 30s. A blood test revealing elevated bilirubin levels with normal liver enzymes (AST and ALT) may be the first clue that you have the condition. Further evaluation is usually not needed, but, if symptoms persist, your doctor may perform additional tests, such as:

  • Liver ultrasound or liver function tests to rule out other problems

  • Gene tests to detect the UGT1A1 gene mutation

  • Liver biopsy (rarely done)

Treatment and Management

Most people with Gilbert's syndrome don't require treatment, as jaundice doesn't cause any long-term problems. To minimize the occurrence of jaundice, try to avoid factors that can increase your bilirubin levels. Some helpful tips include:

  • Eating regular meals

  • Staying hydrated

  • Managing stress through relaxation techniques

  • Getting enough sleep

  • Limiting alcohol intake

  • Avoiding long and strenuous workouts

The liver enzyme that breaks down bilirubin also metabolizes certain medications, such as acetaminophen, irinotecan (a cancer drug), protease inhibitors (used to treat HIV and hepatitis C), and monoclonal antibodies (used to treat autoimmune diseases). If you have Gilbert's syndrome and take any of these drugs, you may be at a higher risk for side effects like diarrhea. Always consult your doctor before starting any new medication and follow the recommended dosage.

For more information about Gilbert's syndrome, visit the following reputable sources:

The Bottom Line

This harmless genetic variant requires no medical treatment and doesn't affect life expectancy, but maintaining regular meal schedules and staying hydrated prevents most symptom flare-ups. If you're experiencing unexplained jaundice or want to confirm a suspected diagnosis, Doctronic can help you get clarity on your symptoms quickly.

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