Acute Fatty Liver of Pregnancy
A rare, serious liver emergency of late pregnancy requiring urgent care
Quick Facts
- Type: Pregnancy-related liver condition
- When: Usually the third trimester
- Severity: Medical emergency for mother and baby
- Main treatment: Prompt delivery and supportive care
Overview
Acute fatty liver of pregnancy (AFLP) is a rare but potentially life-threatening condition that usually appears in the third trimester or shortly after delivery. Tiny droplets of fat accumulate inside liver cells, interfering with the liver's normal work and leading to rapid liver dysfunction or failure.
Although uncommon, AFLP is a medical emergency. It can progress quickly and affect many organs, so early recognition and urgent treatment are essential. With prompt delivery and supportive hospital care, most women recover fully, and the liver typically returns to normal afterward.
Symptoms
Symptoms often begin vaguely and worsen over days. They may include:
- Nausea and vomiting
- Pain in the upper right abdomen or stomach area
- Loss of appetite and general feeling of being unwell
- Extreme tiredness
- Yellowing of the skin and eyes (jaundice)
- Excessive thirst
- In severe cases, confusion, bleeding, or signs of low blood sugar
AFLP is an emergency. A pregnant or recently delivered woman with persistent vomiting, abdominal pain, jaundice, or confusion needs immediate medical assessment.
Causes
The exact cause is not fully understood, but AFLP is linked to problems in how the body breaks down fat. In some cases, an inherited difference in a fat-processing enzyme in the baby leads to a buildup of fatty substances that overwhelm the mother's liver during pregnancy.
AFLP shares features with other serious pregnancy conditions involving the liver and is thought to sit on a spectrum with them. It is not caused by anything the mother did or ate, and it cannot be prevented by diet or lifestyle.
Risk Factors
- First pregnancy
- Carrying twins or more
- Carrying a male baby
- Being underweight
- A previous pregnancy affected by AFLP
- An inherited fat-metabolism disorder in the baby
Even with risk factors, AFLP remains rare, and most pregnancies are unaffected.
Diagnosis
Doctors diagnose AFLP based on the clinical picture combined with laboratory tests, after ruling out other conditions. Evaluation may include:
- Blood tests showing abnormal liver function, low blood sugar, clotting problems, and changes in kidney function and blood counts.
- Assessment for related conditions such as preeclampsia and HELLP syndrome, which can overlap.
- Imaging such as ultrasound to look at the liver and exclude other causes.
- Liver biopsy, which can confirm the diagnosis but is rarely needed and often avoided because treatment cannot wait.
Treatment
AFLP is treated as an emergency in hospital, often in an intensive care setting, with two main goals: delivering the baby and supporting the mother.
- Prompt delivery: The most important step is delivering the baby quickly, since this allows the liver to begin recovering. The timing and method depend on the mother's and baby's condition.
- Supportive care: Correcting low blood sugar, managing clotting and bleeding problems, supporting blood pressure and kidney function, and close monitoring.
- Blood products may be given for clotting abnormalities.
- Specialist care: A team including obstetric, liver, and intensive care specialists is usually involved.
Most women's liver function returns to normal within days to weeks after delivery.
Prevention
AFLP cannot be reliably prevented because its cause is not fully understood and it is largely unpredictable. The best protection is good prenatal care so that warning signs are caught early:
- Attend all prenatal appointments
- Report new nausea, vomiting, upper abdominal pain, or jaundice promptly
- If you have had AFLP before, discuss closer monitoring in future pregnancies
- Testing for an inherited fat-metabolism disorder may be advised for the baby and family after AFLP
When to See a Doctor
Seek emergency care during the third trimester or after delivery if you have:
- Persistent nausea and vomiting
- Pain in the upper right abdomen
- Yellowing of the skin or eyes
- Unusual drowsiness, confusion, or fainting
- Unexplained bleeding or bruising
These can be signs of a serious liver problem in pregnancy and need urgent evaluation. Do not wait for a routine appointment.
Frequently Asked Questions
Is acute fatty liver of pregnancy an emergency?
Yes. AFLP can cause rapid liver failure and affect many organs in mother and baby, so it is a medical emergency. Persistent vomiting, upper abdominal pain, jaundice, or confusion in late pregnancy needs immediate hospital assessment.
What is the main treatment for AFLP?
The key treatment is prompt delivery of the baby, which allows the mother's liver to recover, along with intensive supportive care for blood sugar, clotting, blood pressure, and kidney function. Care is provided by a specialist hospital team.
Will my liver recover after AFLP?
In most cases, yes. Liver function usually returns to normal within days to weeks after delivery, and lasting liver damage is uncommon when AFLP is recognized and treated promptly.
Can AFLP happen again in a future pregnancy?
It can recur, especially when linked to an inherited fat-metabolism disorder, though recurrence is not certain. Women who have had AFLP should discuss closer monitoring and possible genetic testing for future pregnancies.
Could I have prevented AFLP?
No. AFLP is not caused by diet, lifestyle, or anything the mother did, and it cannot be reliably prevented. The most helpful step is good prenatal care so symptoms are caught and treated early.
References
- American College of Obstetricians and Gynecologists (ACOG).
- MedlinePlus, U.S. National Library of Medicine.
- National Organization for Rare Disorders (NORD). Acute fatty liver of pregnancy.
- Cleveland Clinic. Acute fatty liver of pregnancy.