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Reye's syndrome

Also called: Reye's syndrome

A rare, serious illness causing brain and liver swelling in children and teens recovering from a virus, linked to aspirin.

PreventionNever give aspirin to children or teens

Overview

It usually starts days after flu or chickenpox with repeated vomiting, then confusion.

Reye's syndrome causes swelling in the liver and brain.

It's linked to aspirin use during a viral illness in children.

Symptoms

Common signs:

  • Repeated vomiting after a virus
  • Confusion or unusual behavior
  • Seizures

Less common

  • Sleepiness

When to get medical care

Call 911Call 911 now for: repeated vomiting after a virus, confusion or unusual behavior, seizures.
Get care todayMilder symptoms that could be early signs.
See a doctor soonQuestions about lowering your risk.

Causes

Linked to aspirin during viral illness.

Does it spread or run in families?

  • It isn't contagious. You can't catch it from someone else.

Who is more likely to get it

  • Children and teens
  • Children and teens given aspirin during flu or chickenpox: Highest risk

Possible complications

  • Seizures: From brain swelling
  • Brain injury: Can be lasting

Diagnosis

This is diagnosed in the emergency room or hospital.

The exam

A physical exam.

Tests

Tests, if needed:

  • Blood tests:

Treatment

Emergency care is needed. While waiting for help:

Self-care

  • Call 911

Prevention

To lower your risk or catch problems early:

  • Avoid aspirin and products with salicylates in children

Which doctor treats this

  • Emergency doctors treat it first, in the ER.
  • They may send you to a neurologist (brain and nerve doctor).

Living with it

Support groups and helplines

Back to school, work, or sports

  • Recovery time varies. Ask your care team when you can drive, lift, work, and exercise.

Children, pregnancy, and older adults

  • Children and teens: Never give aspirin unless a doctor says to.

Pregnancy and breastfeeding

  • If you're pregnant or planning to be, tell your prenatal provider about this condition.
  • Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
  • Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
  • Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.

For caregivers

  • Go to visits when you can and take notes.
  • Keep a list of medicines, allergies, and doctors in one place.
  • Learn the warning signs that need fast care.
  • Learn CPR. Many hospitals and the Red Cross offer classes.
  • Take breaks and ask for help. Caregivers need care too.

Outlook

Early care improves recovery.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

  • A list of your medicines and supplements
  • Notes on when symptoms started and what makes them better or worse

Questions to ask

  • What follow-up care do I need?
  • How can I prevent this from happening again?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Reye's syndrome

Sources

Last updated 2026-11-12.