Health Insights · Endocrine & metabolic
Gilbert's syndrome: a harmless cause of mild jaundice
Gilbert's syndrome is a common, harmless inherited variation affecting how the liver processes bilirubin. It affects around one in twenty people, causes a mildly raised bilirubin on blood tests, and is the reason a great many people are investigated for liver disease they do not have.
Raised bilirubin needs proper investigation if there is also
- dark urine and pale stools
- itching, particularly widespread and without a rash
- abdominal pain, fever or weight loss
- abnormal ALT, ALP or clotting, or a low platelet count
- persistent jaundice rather than occasional mild yellowing
- anaemia, which suggests the red cells are breaking down
Gilbert's raises only unconjugated bilirubin, with everything else normal. Any other abnormal liver test, or bilirubin accompanied by these symptoms, points away from Gilbert's and needs investigating properly.
What is happening
Bilirubin is produced continuously as old red blood cells are broken down. An enzyme in the liver processes it for excretion. In Gilbert's syndrome that enzyme works at around 30% of normal capacity — ample under ordinary conditions, but not quite enough when production rises or the liver is under stress. Bilirubin then accumulates mildly, and may cause a faint yellow tinge to the whites of the eyes.
What makes the level rise
- Fasting or skipping meals — including the fast before a blood test, which is a common reason it is discovered
- Illness or infection, including a simple cold
- Dehydration, and vigorous or prolonged exercise
- Alcohol, and lack of sleep
- Stress, and in women, menstruation
- Levels typically fluctuate between normal and mildly raised, which is itself characteristic
How it is confirmed
Usually by pattern rather than by a special test: an isolated raised unconjugated bilirubin, with normal ALT, ALP, GGT, albumin, clotting and full blood count, on more than one occasion, in someone who is well. A blood film and reticulocyte count exclude red cell breakdown as an alternative explanation. Genetic testing exists but is rarely needed. Once the pattern is established, no further investigation and no monitoring is required — and knowing that saves years of repeated blood tests and scans.
What it means for you
- It is not liver disease. It does not progress, does not cause cirrhosis, and does not affect life expectancy.
- No treatment is needed, and no dietary restriction is required.
- Some people report fatigue or vague abdominal discomfort during episodes. Whether this is caused by Gilbert's is debated, but eating regularly and staying hydrated helps.
- It is inherited, so relatives may have it too — useful to know if their results are ever questioned.
- Tell any clinician about it, so a raised bilirubin in future is not misinterpreted as new liver disease.
The one practical implication
The same enzyme processes certain medicines, so a small number are handled more slowly and can cause more side effects. The most relevant are irinotecan (a chemotherapy drug), atazanavir (an HIV medicine), and occasionally paracetamol at high doses over long periods. This is rarely an issue in ordinary life, but it is worth having recorded in your notes.
Worth doing
- Eat regularly; avoid prolonged fasting
- Stay well hydrated, particularly around exercise
- Keep alcohol moderate
- Have it recorded clearly in your medical records
- Mention it before any chemotherapy or new long-term medicine
Not necessary
- Repeated liver blood tests and scans once confirmed
- Liver detox products or supplements
- Avoiding any particular foods
- Restricting exercise
- Worrying about the yellow tinge, which is harmless
Why come to us. The value here is a clear answer and an end to the investigations. We take the full liver panel, blood film, reticulocyte count and haemolysis screen in-house and explain the pattern to you in the same visit — confirming Gilbert's where that is what it is, or identifying the cause where it is not. You leave with a written explanation you can show any future clinician, rather than a lingering worry about an abnormal result nobody explained.
Private assessment for Gilbert's syndrome in London
Gilbert's syndrome is a common, harmless condition where bilirubin rises at times of stress, fasting or illness, sometimes causing mild yellowing — and no treatment is needed. A private GP in East London can confirm it with blood tests and reassure you, while excluding other liver causes. Tower Bridge Hospital is on Whitechapel Road in East London, a short journey from Canary Wharf and the City, with same-day appointments and no referral required.
Gilbert's syndrome in London: common questions
Is Gilbert's syndrome serious?
No — it is a harmless, inherited variation; it does not damage the liver and needs no treatment.
How is it diagnosed?
From the pattern of a mildly raised bilirubin with otherwise normal liver tests, after excluding other causes.
Do I need treatment?
No treatment is needed; knowing you have it explains occasional mild yellowing at times of stress, fasting or illness.
Can I be seen the same day?
Yes — same-day private GP appointments are available most days.
A clear answer, and an end to the repeat tests
Full liver panel in-house, explained in person. 7 days a week.