What is Gilberts syndrome

Gilbert’s syndrome is a common, benign liver condition where the liver does not properly process bilirubin, a yellowish pigment produced by the breakdown of red blood cells. Most people with Gilbert’s syndrome remain asymptomatic throughout their lives, though some may experience mild, intermittent jaundice during periods of stress, fasting, or illness.

What is Gilbert’s syndrome and how does it affect the body?

Gilbert’s syndrome is a lifelong genetic condition that affects the liver's ability to conjugate bilirubin. In a healthy liver, an enzyme called UGT1A1 works to process bilirubin so it can be excreted from the body. In individuals with Gilbert’s syndrome, this enzyme's activity is reduced to about 30% of normal levels. Because the liver cannot process bilirubin efficiently, the substance builds up in the bloodstream, a state known as unconjugated hyperbilirubinemia. While the liver itself is structurally healthy and functions normally in all other aspects, the resulting accumulation of bilirubin can occasionally cause a slight yellowish tint to the skin or the whites of the eyes.

How common is Gilbert’s syndrome and who is affected?

Gilbert’s syndrome is surprisingly common, affecting an estimated 3% to 7% of the general population. It is often discovered during routine blood tests that show slightly elevated bilirubin levels, rather than through symptoms. The condition typically manifests after puberty, as hormonal changes influence bilirubin levels. While it affects both men and women, it is diagnosed more frequently in males, possibly due to higher baseline bilirubin levels in men. Because it is a genetic trait, it is found globally across all ethnic groups, and at DiseaseMaps.org, we currently have 239 people with Gilbert’s syndrome who have joined our community to share their experiences.

What are the primary triggers for symptoms?

For most people, Gilbert’s syndrome is entirely asymptomatic. However, when jaundice does occur, it is usually triggered by physiological stress that increases the body's demand for bilirubin processing. Common triggers include:

• Prolonged fasting or skipping meals.


• Physical exertion or intense exercise.


• Dehydration.


• Illness, such as the common cold or flu.


• Menstruation in women.


• Emotional stress or trauma.

Is Gilbert’s syndrome hereditary?

Yes, Gilbert’s syndrome is an inherited condition. It is caused by a mutation in the UGT1A1 gene, which is passed down from parents to their children. It is primarily inherited in an autosomal recessive pattern, meaning that an individual typically needs to inherit two copies of the mutated gene to manifest the condition. Because it is a genetic variation rather than a disease in the traditional sense, it does not progress, nor does it cause permanent liver damage or require specialized medical treatment.

How does it differ from other liver conditions?

The most important clinical distinction is that Gilbert’s syndrome is benign. Unlike hepatitis, cirrhosis, or biliary obstruction, Gilbert’s syndrome does not cause liver scarring or inflammation. A key diagnostic feature is that liver enzyme tests (such as ALT and AST) remain within the normal range, and there is no evidence of liver disease on imaging studies. If a patient’s blood work shows high liver enzymes alongside elevated bilirubin, a physician will typically investigate causes other than Gilbert’s syndrome.

Next steps

• Consult a primary care physician or gastroenterologist to confirm the diagnosis through blood tests and rule out other conditions.


• Maintain a consistent lifestyle, including regular meal times and adequate hydration, to minimize the risk of jaundice.


• Join our community at DiseaseMaps.org to connect with the 239 other members living with Gilbert’s syndrome.


• Inform your healthcare providers of your diagnosis, especially before starting new medications, as some drugs are processed by the same liver pathways.

Medical disclaimer: This content is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician regarding any medical condition.

References

• National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD): Gilbert Syndrome.


• Orphanet: Gilbert Syndrome (ORPHA:378).


• Online Mendelian Inheritance in Man (OMIM): Hyperbilirubinemia, Gilbert Type (Entry #143500).


• American Liver Foundation: Gilbert’s Syndrome Overview.