What Happens When Your Body Rejects a Liver Transplant?

Rejection is your immune system doing its normal job: it treats the donated liver as something foreign and attacks it. For most people who go through an episode, though, it is a treatable setback found on blood tests rather than the loss of the new organ.¹

What the Immune System Does to a New Liver

In the common early type, acute cellular rejection, white blood cells pour into the areas around the liver’s small blood vessels.² From there they inflame the lining of the liver’s veins and damage the small bile ducts that carry bile out of the liver.³ The liver then struggles to process and drain bile, which is why bile-related signs show up first in blood tests and later on the skin.

Your body sees the donated liver as foreign because every person’s cells carry identity markers, and the donor’s differ from yours even with a good blood-type match. The immune system is built to attack anything with unfamiliar markers, so rejection is expected biology, not a sign you did something wrong.

Doctors usually divide rejection into acute rejection, which usually comes on early, and chronic rejection, which marks gradual loss of bile ducts.⁴ A third, much rarer form is driven by antibodies already in the blood and can destroy a liver within hours to days of surgery.⁵

Rejection is also different from a new liver that simply never starts working properly after surgery. In rejection, the liver first works and then is damaged by the immune system, so doctors look for that early period of working before they call something rejection.

Daily medicines called immunosuppressants, the anti-rejection drugs, damp down the immune response for as long as the transplanted liver is in place. Rejection usually happens when the immune response gets ahead of the medicine, whether from too low a dose, missed doses, or an unusually strong reaction.

How Common Rejection Is and When It Strikes

Acute cellular rejection occurs in roughly 15% to 25% of liver recipients.⁶ It most often appears between 5 and 30 days after surgery, and 60% or more of episodes happen within the first 6 weeks.⁷ The first weeks bring frequent blood tests timed to catch this window. Most recipients never have an acute episode, but the risk never drops fully to zero, which is why monitoring continues for life.

Acute rejection can still happen months or years later, and one reported case occurred 22 years after transplant.⁸ Very fast rejection from pre-existing antibodies is rare when donor and recipient blood types are compatible.⁹ In one center it caused 2 graft failures out of 81 liver transplants.¹⁰

The liver is rejected less fiercely than many other organs. Antibody-driven rejection is less common after liver transplants than after kidney, heart or lung transplants.¹¹ The liver’s double blood supply and its resident clean-up cells can soak up and clear harmful antibodies.¹²

Signs and Symptoms to Watch For

Blood tests often show rejection before you feel anything. Your team checks liver function tests (LFTs), which may appear on your report as ALT, AST, GGT and total bilirubin.¹³ But liver blood tests rise with other problems too, so they raise the alarm rather than prove rejection.¹⁴

Early symptoms are vague and flu-like:

Low-grade fever or a flu-like feeling so keep every scheduled lab appointment even when you feel well.¹⁵
Tiredness¹⁶
Stomach discomfort¹⁷
Pain over the liver in some sudden episodes¹⁸

Later signs mean bile is backing up:

Yellowing of the skin or eyes¹⁹
Pale stools and dark urine²⁰
Itching²¹
A swollen belly from fluid collecting around the liver²²

Chronic rejection is quieter. It usually shows only fatigue and slowly drifting liver blood tests,²³

Any fever after transplant deserves a same-day call, because infection and rejection both start this way. Yellow eyes, dark urine or pale stools should never wait for the next appointment. Before you call, write down when symptoms began and any missed or late doses. Don’t adjust your anti-rejection medicine on your own in response to symptoms.

How Doctors Confirm Rejection

Routine blood tests are not accurate enough to diagnose rejection with confidence, so a liver biopsy remains necessary.²⁴ The pathologist looks for inflamed portal areas, inflamed vein linings and damaged bile ducts.²⁵ Each of these three is scored from 0 to 3 and added into one severity score.²⁶ A higher total points to more severe rejection and helps decide how strong treatment should be.

A biopsy is done by passing a thin needle through the skin over the liver, usually with local numbing and ultrasound guidance. It takes a small sliver of tissue, and the procedure itself is short. You typically rest and are watched for some hours afterward for bleeding. Results may take a day or more, and treatment sometimes starts while you wait.

Reports may describe rejection as mild, moderate or severe. Mild rejection is sometimes handled by adjusting your regular medicine rather than with strong treatment. Ask your team what grade you have and what it means for your plan.

Infection can look like rejection. Cytomegalovirus, a common virus, can infect a transplanted liver and look like acute rejection both in symptoms and under the microscope.²⁷ Telling them apart matters because rejection needs more immune suppression while infection needs less.

How Acute Rejection Is Treated and How Often It Works

Moderate or severe acute rejection is first treated with short bursts of high-dose steroids plus a higher dose of your regular anti-rejection medicine.²⁸ Steroids switch off the immune cells driving the attack,²⁹ and they reverse about 60% to 75% of rejection episodes.³⁰ Rejection that doesn’t respond to steroids is uncommon.³¹

Pulse steroids are usually given by drip over a few days, often in hospital. Common short-term effects include high blood sugar, trouble sleeping, mood swings and a bigger appetite. These usually settle once the high doses taper. Expect repeat blood tests to check that your liver numbers are falling.

When steroids fail, steroid-resistant rejection can be treated with anti-thymocyte globulin, an antibody drug that clears out immune cells.³² In small groups of patients it worked in roughly 10 of 12, 9 of 11 and 13 of 13 people.³³ Liver blood tests can drop sharply within a day and keep falling for months afterward.³⁴ But it carries significant side effects, including serious infection.³⁵

Each step up in treatment lowers your defences against viruses and fungi too. Teams often give preventive anti-infection medicine during and after strong treatment. Report a fever or new cough promptly in the weeks after treatment.

Chronic and Antibody Rejection

The hallmark of chronic rejection is loss of the small bile ducts.³⁶ Immune cells attack the ducts directly while narrowed small arteries starve them of blood.³⁷ Most acute episodes are reversed and never lead to chronic rejection, and chronic rejection can develop without an obvious earlier acute episode. The more the arteries narrow, the more ducts are lost.³⁸ It typically progresses to permanent damage and liver failure needing a new transplant.³⁹

Living with suspected chronic rejection means closer monitoring, with more frequent blood tests and possibly repeat biopsies. Doctors may change or add anti-rejection medicines to try to slow the damage. Itching and fatigue are common and can be treated for comfort. Early discussion of a second transplant is normal planning, not giving up.

Some rejection is driven by donor-specific antibodies, meaning antibodies against the donor liver, which damage its small blood vessels.⁴⁰ It is frequently missed and has no standard treatment.⁴¹ The liver’s protection can be overwhelmed when these antibodies are strong, persistent or newly formed after transplant.⁴² In one group, follow-up biopsies returned to normal within 6 to 12 months of treatment.⁴³

Does Rejection Shorten Survival

Early acute rejection is usually reversible and has little effect on how long the new liver lasts.⁴⁴ Five-year survival was about 83% in recipients who had acute rejection and 79% in those who didn’t.⁴⁵

Acute rejection that appears late after transplant is linked to lower patient and liver survival.⁴⁶ Late rejection often signals too little immune suppression over a longer period.

After an episode, ask whether it was early or late rejection and how severe it was. Ask whether your medicine doses or blood level targets will change, and how often you will need blood tests from now on.

Lowering Your Risk of Rejection

Not taking anti-rejection medicine as prescribed is linked to rejection and loss of the liver.⁴⁷ People more often slip when the regimen is complicated, they know little about their medicines, they believe in alternative remedies, or the cost is hard to manage.⁴⁸

Phone alarms and a weekly pill organizer help. Check with the team before taking herbal products or new prescriptions, since some change drug levels. Keep a few days’ spare supply when travelling, and tell the team about cost problems so they can find assistance or alternatives.

Many anti-rejection drugs are dosed by measuring their level in your blood. Doses are often taken at set times before a blood draw so the reading is accurate. Too low a level invites rejection, while too high causes side effects.

Children process anti-rejection medicines differently from adults, so doses are harder to get right.⁴⁹ The move from children’s to adult transplant care is a key time to guard against missed doses and liver loss.⁵⁰

If the Liver Fails or Treatment Doesn’t Work

When a liver fails for good, a second transplant is the main option.⁵¹ After a repeat transplant for late failure, about 69% of people were alive at 1 year and 62% at 5 years.⁵² People who were less sick at the time did much better, with about 89% alive at 1 year versus 53% for the sickest.⁵³ Serious infection before surgery strongly raises the risk of dying soon after a repeat transplant.⁵⁴

Being listed before you become very ill improves your chances, and teams weigh whether the operation is likely to succeed before offering it. Treating infections before surgery is part of preparation.

Newer blood tests may help catch rejection sooner. One measures the donor liver’s DNA in your bloodstream and may spot rejection earlier than liver blood tests. It is not yet standard, so a biopsy is still used to confirm.⁵⁵

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