Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
About Reye Syndrome
Reye syndrome is a rare illness that can affect the blood, liver, and brain of someone who has recently had a viral infection. It always follows another illness. Although it mostly affects children and teens, anyone can get it. It can develop quickly and without warning. It is most common during flu season. Symptoms include:
- Nausea and vomiting
- Listlessness
- Personality change - such as irritability, combativeness or confusion
- Delirium
- Convulsions
- Loss of consciousness
If these symptoms occur soon after a viral illness, seek medical attention immediately. Reye syndrome can lead to a coma and brain death, so quick diagnosis and treatment are critical. Treatment focuses on preventing brain damage. There is no cure.
The cause of Reye syndrome is unknown. Studies have shown that taking aspirin increases the risk of getting it. Because of that, health care professionals now recommend other pain relievers for young patients.
It sits within Brain and Nerves.
The lead U.S. institute for this subject is the National Institute of Neurological Disorders and Stroke.
When to speak to someone. Reading about a topic cannot tell you whether it applies to you. Speak to a doctor or pharmacist if symptoms are severe, sudden, getting worse, or simply not going away — and seek emergency care immediately for chest pain, breathing difficulty, sudden weakness or confusion, or a serious allergic reaction.
Where to read more
Rather than paraphrase, we point you to the primary sources. Every link below is to a government health agency, a national institute or a recognised medical body — grouped by what you are trying to find out.
Learn More
- Ammonia LevelsNational Library of Medicine
- CSF analysisMedical Encyclopedia
- Reye SyndromeNemours Foundation
- Reye syndromeMedical Encyclopedia
- Reye's SyndromeNational Institute of Neurological Disorders and Stroke
Medical subject headings
Clinicians and researchers index this subject under Reye Syndrome. These are the terms to use when searching medical literature.
This page is built from the MedlinePlus health topic record for Reye Syndrome, a service of the U.S. National Library of Medicine (NLM), National Institutes of Health. Information is from MedlinePlus.gov. PocketsInfo is not affiliated with, and is not endorsed by, the NLM or the NIH. Retrieved 30 July 2026.