Liver transplantation saves lives, but the procedure carries a wide spectrum of complications that can appear within hours of surgery or emerge years later. Some are surgical emergencies, like a clot in the hepatic artery. Others are slow-burning problems, like kidney damage from the very drugs that keep the new liver alive. Understanding what can go wrong, when to expect it, and how treatable each complication tends to be gives recipients and their families a realistic picture of the road ahead.
Blood Supply Problems in the First Days
The most feared early complication is hepatic artery thrombosis, a blood clot that blocks the main artery feeding the new liver. The hepatic artery is the bile ducts’ sole blood supply, so losing it can trigger rapid bile duct destruction, graft failure, and death if not caught quickly. Without urgent surgical restoration of blood flow or retransplantation, early hepatic artery thrombosis occurring within the first few days is considered nearly universally fatal.1PubMed Central. Management of early hepatic artery occlusion after liver transplantation with failed rescue
A systematic review found that the overall death rate among patients who develop early hepatic artery thrombosis is about a third, and more than half require retransplantation.2PubMed. Early hepatic artery thrombosis after liver transplantation: a systematic review of the incidence, outcome and risk factors Children face a higher retransplantation rate than adults for this complication but tend to survive at higher rates. Risk factors include variant artery anatomy, longer surgical times, retransplantation, and being at a lower-volume transplant center.
Speed of detection matters enormously. In a large pediatric series covering 20 years of transplants, routine Doppler ultrasound screening caught hepatic artery thrombosis early enough for surgeons to restore blood flow in many cases, producing a 20-year graft survival rate of 77% when revascularization succeeded, compared with just 24% when it was not attempted or failed.3American Journal of Transplantation. Long-term outcome of children who experience early hepatic artery thrombosis after liver transplantation That gap explains why transplant teams monitor blood flow with ultrasound so aggressively in the first two weeks.
Biliary Strictures
Bile duct narrowing, or strictures, are among the most common complications following liver transplantation. The reported rate runs roughly 5% to 15% after transplants from deceased donors and climbs to about 28% to 32% after living-donor transplants, where the smaller duct caliber and more complex surgical reconstruction raise the risk.4PubMed Central. Biliary strictures after liver transplantation
Strictures fall into two categories that behave very differently. Anastomotic strictures form at the surgical connection point between the donor and recipient bile ducts. These respond well to endoscopic treatment with repeated balloon dilation and plastic stent placement.5PubMed Central. Management of Biliary Strictures After Liver Transplantation Non-anastomotic strictures, which occur higher up in the bile duct tree, are a more serious problem. They carry higher recurrence rates, respond less well to endoscopy, and more frequently lead to graft loss or the need for retransplantation.6PubMed Central. Biliary strictures after liver transplantation When endoscopic approaches fail, options include percutaneous drainage or surgical revision.
Ischemia-Reperfusion Injury and Early Graft Dysfunction
Every transplanted liver sustains some degree of ischemia-reperfusion injury. The organ is deprived of its blood supply during removal, preservation, and implantation, and when blood flow returns, a cascade of damage from oxygen deprivation, oxidative stress, and inflammatory signaling kicks in. This process can cause early graft dysfunction and, in severe cases, outright graft failure.7PubMed Central. Mechanistic Insight and Clinical Implications of Ischemia/Reperfusion Injury Post Liver Transplantation
One promising advance for reducing this injury is machine perfusion, in which the donor liver is kept on a device that circulates cold or warm fluid through it rather than simply being stored on ice. A randomized trial found that hypothermic machine perfusion cut the rate of non-anastomotic biliary strictures from 18% in the standard cold-storage group to 6% in the machine-perfusion group, and the total number of treatments needed for those strictures dropped by a factor of nearly four.8PubMed. Hypothermic Machine Perfusion in Liver Transplantation – A Randomized Trial A meta-analysis confirmed the pattern, finding that machine perfusion roughly halved the odds of early graft dysfunction and cut non-anastomotic strictures by about two-thirds compared with conventional cold storage.9Visceral Medicine. Machine Perfusion in Liver Transplantation: A Systematic Review and Meta-Analysis
Rejection
The liver is more tolerant of immunological mismatch than most other transplanted organs. Hyperacute rejection, the immediate antibody-driven destruction that can destroy a kidney graft within minutes, is rare in liver recipients. Acute rejection still occurs but generally responds well to steroid treatment, and steroid-resistant rejection is uncommon. Chronic rejection has become less frequent in the modern era thanks to improved drug regimens.10PubMed Central. Acute and Chronic Rejection After Liver Transplantation: What A Clinician Needs to Know
That said, chronic rejection does still happen, and when it does, it can be difficult to reverse. Research has linked the presence of high-intensity donor-specific antibodies in the recipient’s blood to chronic rejection after liver transplant.11PubMed Central. High mean fluorescence intensity donor-specific anti-HLA antibodies associated with chronic rejection Postliver transplant When chronic rejection progresses to the point of graft failure, retransplantation becomes the only option, which is why transplant teams track these antibody levels over time.
Infections After Transplant
Because recipients must take immunosuppressive drugs for the rest of their lives, infections are a constant concern. The pattern of infections shifts over time. Bacterial infections dominate the first month, often related to the surgery itself, while opportunistic infections become the greater threat in the months that follow.
Cytomegalovirus, or CMV, is the single most common opportunistic infection in liver transplant recipients and directly worsens post-transplant outcomes.12PubMed Central. Cytomegalovirus infection after liver transplantation Risk depends heavily on whether the donor and recipient have been previously exposed to the virus. A CMV-positive donor organ going into a CMV-negative recipient creates the highest risk scenario. In one single-center study, half of patients in this high-risk group developed CMV infection, and about 38% progressed to actual CMV disease, compared with low single-digit percentages in intermediate- and low-risk groups.13Journal of Liver Transplantation. The current status of CMV prophylaxis and treatment in liver transplant recipients: A single center study
Prevention strategies include antiviral prophylaxis, where recipients take an antiviral drug for a set period after transplant, and pre-emptive therapy, where blood is monitored regularly and treatment begins at the first sign of viral replication. Even with prophylaxis, CMV disease can still develop in up to half of high-risk patients.14PubMed Central. Management of cytomegalovirus infection after liver transplantation Newer antivirals are under study, but guidelines have not yet endorsed them as standard options for solid organ recipients.
Beyond viral threats, the transplant recipient’s own gut bacteria can cause problems. Surgery and the critical illness surrounding it damage the intestinal barrier, allowing bacteria that normally stay in the gut to leak into the bloodstream. This bacterial translocation contributes to early post-transplant infections, and the resulting inflammatory signaling has been linked to non-infectious complications too, including kidney dysfunction and graft rejection.15PubMed Central. The role of gut barrier dysfunction in postoperative complications in liver transplantation: pathophysiological and therapeutic considerations
Immunosuppression Side Effects
The drugs that prevent rejection create their own set of problems. Calcineurin inhibitors, the backbone of most transplant immunosuppression regimens, are toxic to the kidneys. Over years, this kidney damage accumulates. A meaningful fraction of liver transplant recipients develop chronic kidney disease severe enough to require dose changes or additional medications. One strategy tested in a randomized trial combined everolimus with a reduced dose of tacrolimus, which improved kidney filtration rate by roughly 8.5 mL/min compared with standard tacrolimus dosing over the first year after transplant.16PubMed Central. Everolimus with reduced tacrolimus improves renal function in de novo liver transplant recipients: a randomized controlled trial These kidney-sparing protocols are increasingly common, though they involve trade-offs in rejection risk and other side effects.
Calcineurin inhibitors can also cause neurological problems. Posterior reversible encephalopathy syndrome, or PRES, occurs when these drugs disrupt the blood-brain barrier, causing swelling in the back of the brain. Symptoms range from headaches and confusion to visual disturbances, seizures, and even coma.17PubMed Central. Neurologic Complications of Transplantation The condition is usually reversible once the drug dose is reduced or switched, but it can be frightening and requires urgent recognition.
Metabolic Syndrome and Cardiovascular Disease
In the long run, cardiovascular disease is the leading cause of death after liver transplantation. The combination of immunosuppressive drugs, weight gain, and changes in metabolism sets up a perfect storm. Metabolic syndrome, marked by obesity, high blood pressure, abnormal cholesterol, and insulin resistance, is extremely common in transplant recipients.18PubMed Central. Metabolic syndrome after liver transplantation: A silent threat to long-term success Recipients who develop metabolic syndrome face up to four times the risk of a cardiovascular event compared with those who do not.19The Lancet Gastroenterology & Hepatology. Metabolic and cardiovascular complications in the liver transplant recipient
Many recipients are surprised to find that, after surviving end-stage liver disease and a major surgery, the primary long-term threat becomes heart disease and diabetes rather than liver failure. Steroids prescribed early after transplant contribute to weight gain and blood sugar spikes. Calcineurin inhibitors independently worsen blood pressure and cholesterol. Managing these metabolic risks with diet, exercise, and medication is as important to long-term survival as preventing rejection.
Disease Recurrence in the New Liver
The disease that destroyed the original liver can come back in the transplanted one. This is especially well documented for metabolic dysfunction-associated steatotic liver disease, previously called nonalcoholic fatty liver disease. A meta-analysis found that the fatty liver condition recurred in roughly 35% to 49% of recipients, and the more aggressive inflammatory form recurred in 11% to 24%.20PubMed. Liver Allograft Cirrhosis, Retransplant, and Mortality Secondary to Recurrent Disease After Transplant for MASH: A Systematic Review and Meta-analysis Most recurrence takes months to years, and the progression to cirrhosis or graft failure is uncommon, occurring in low single-digit percentages.21PubMed Central. Déjà vu! A Case of Recurrent Metabolic Dysfunction-Associated Steatohepatitis 70 Days After Liver Transplantation
Autoimmune liver diseases also recur. Primary biliary cholangitis, primary sclerosing cholangitis, and autoimmune hepatitis can all reappear in the graft, though the pattern and timing differ from the original disease because the recipient is on immunosuppressive therapy.22PubMed. Autoimmune liver diseases and recurrence after orthotopic liver transplantation: what have we learned so far? Diagnosing recurrence can be tricky, because biopsy findings overlap with rejection and drug toxicity.
Rare but Serious Immunological Complications
Two uncommon complications deserve mention because they carry very high mortality when they do occur.
Post-transplant lymphoproliferative disease, or PTLD, is a spectrum of abnormal lymphocyte growth, ranging from benign overgrowth to full-blown lymphoma, driven by Epstein-Barr virus in the setting of heavy immunosuppression.23PubMed Central. Post-transplant lymphoproliferative disease following liver transplantation Reducing immunosuppression is the first treatment step, with chemotherapy reserved for more aggressive forms.
Graft-versus-host disease occurs when immune cells carried within the donor liver attack the recipient’s own body. It is rare, developing in under 1% of recipients, typically showing up about a month after surgery with skin rash, low blood counts, and diarrhea. But it is devastating. One case series reported 73% six-month mortality, with sepsis as the most common cause of death.24PubMed Central. Graft versus Host Disease After Liver Transplantation in Adults: A Case series, Review of Literature, and an Approach to Management A more recent series found a similar mortality rate of 66% despite modern treatments including targeted agents.25Journal of Liver Transplantation. Graft versus host disease after liver transplantation: A single center case series The rarity of the condition makes it hard to study in randomized trials, and treatment remains largely empirical.
Bone Health After Transplant
Bone loss is a common but frequently overlooked problem. Many recipients already have weakened bones before transplant due to chronic liver disease, malnutrition, and limited mobility. After surgery, high-dose steroids accelerate bone loss further. The result is high rates of osteopenia and osteoporosis, which can lead to fractures that significantly affect quality of life.26PubMed Central. Caring for the Bone Health Among Liver Transplant Recipients Because bone thinning is painless until a fracture occurs, it tends to receive less attention than complications that announce themselves with obvious symptoms. Screening with bone density scans and early treatment with calcium, vitamin D, and sometimes bone-strengthening medications are part of good post-transplant care.
Abdominal Wall Hernias
Incisional hernias are the most significant abdominal wall complication after liver transplantation.27PubMed Central. Incidence and risk factors for recurrence of incisional hernia repair after liver transplantation: a retrospective cohort study The large surgical incision, combined with immunosuppressive drugs that slow wound healing, creates conditions for the abdominal wall to weaken. Hernias can cause pain, bowel obstruction, and reduced quality of life.28PubMed Central. Incisional Hernias Post Liver Transplantation: Current Evidence of Epidemiology, Risk Factors and Laparoscopic Versus Open Repair. A Review of the Literature Repair is straightforward in principle but carries a higher recurrence rate in transplant patients than in the general population, partly because the immunosuppressive medications that impair wound healing are permanent.
Mental Health and Medication Adherence
Psychiatric diagnoses are common after liver transplantation and are associated with increased healthcare use and financial burden for patients.29PubMed. Psychiatric diagnoses are common after liver transplantation and are associated with increased health care utilization and patient financial burden Depression, anxiety, and adjustment disorders can all emerge or worsen in the months following transplant, even among people who felt psychologically well beforehand. The stress of a complex medication schedule, ongoing medical appointments, and the existential weight of living with another person’s organ all contribute.
Mental health struggles feed directly into one of the most consequential long-term risks: not taking medications as prescribed. Medication nonadherence after liver transplantation is linked to graft rejection and graft loss.30PubMed Central. Medication misuse, nonadherence, and clinical outcomes among liver transplant recipients The reasons are varied. Some recipients feel so well that they question the need for daily pills. Others struggle with side effects, cost, or cognitive changes. Transplant programs increasingly build mental health support and adherence counseling into routine follow-up care, recognizing that a technically successful transplant can still fail if the patient cannot sustain the medication regimen.
Complications Specific to Pediatric Recipients
Children face many of the same complications as adults but with additional wrinkles. Their smaller blood vessels make vascular reconstruction more difficult, and mismatches in vessel size between donor and recipient are more common, especially with living-donor or split grafts. When surgeons use vein grafts to bridge size discrepancies, the rate of vascular complications increases.31PubMed Central. Impact of Graft Type on Outcome in Pediatric Liver Transplantation Children who receive a transplant as infants also face decades of immunosuppression, meaning the cumulative risks of kidney damage, metabolic syndrome, infections, and malignancy are amplified simply by the length of exposure. Transitioning teenage recipients to adult transplant care is another vulnerable period where adherence problems tend to spike.