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FPIES: the delayed vomiting food allergy

What food protein-induced enterocolitis syndrome is, how it differs from a typical food allergy, how common it is, and what studies report about outgrowing it.

2 minute read5 sources, each checked word for wordLibrary checked October 18, 2026

In short

  • FPIES is a food allergy that does not involve IgE. It causes delayed, repeated vomiting with lethargy and pallor, usually 1 to 4 hours after the food.Review1
  • It can be severe and lead to shock, yet awareness is low.E2Good2
  • In a large study of cow's milk FPIES, 90% of children had recovered by age 3.E2Good3

How sure each claim is:E1StrongE2GoodOfficial textReviewWhat the grades mean

If a child is very sleepy, pale or floppy after vomiting

Call 911 or go to the emergency department now. Severe reactions need emergency care.

What is FPIES?

Food protein-induced enterocolitis syndrome is a non-IgE-mediated food allergy of the gut. It is marked by delayed, prolonged vomiting with lethargy and pallor, usually 1 to 4 hours after eating the food.Review1

International consensus guidelines describe it as a cell-mediated food allergy that can be severe and lead to shock.E2Good2

In one series of 66 episodes, vomiting occurred in every episode, lethargy in 85%, pallor in 67% and diarrhea in 24%.E2Good4

How is it different from a typical food allergy?

US guidelines on food allergy cover both IgE-mediated reactions and non-IgE reactions such as this one.E2Good5

In a large study of infants, the presentation of cow's milk FPIES was distinct from IgE-mediated cow's milk allergy.E2Good3

How common is it, and do children outgrow it?

In a study that followed 13,019 infants from birth, the cumulative incidence of cow's milk FPIES was 0.34%.E2Good3

All of those children had FPIES within the first 6 months of life, and by age 3, 90% had recovered.E2Good3

Most children recover, although some may go on to develop an IgE-mediated milk allergy.E2Good3

How was the first international guidance made?

The first international evidence-based guidelines for FPIES came from a workgroup of the American Academy of Allergy, Asthma and Immunology with the International FPIES Association.E2Good2

What is not known yet

High-quality studies on how FPIES works, how to diagnose it and how to manage it are lacking, and outcomes are not well established.E2Good2

Questions you might bring to your clinician

  1. Do these episodes fit FPIES, or another kind of reaction?
  2. Is there a written plan for an episode, and what should an emergency team be told?
  3. Which foods are involved, and when might they be tried again under supervision?
  4. Is there any sign of IgE-mediated allergy as well?

Every claim in this guide was written from its sources and checked against them word for word. Its clinical review by Dr. Recio, whose specialty is anesthesia, is pending; an allergist has not yet reviewed it. This line changes when each review is done.

Sources

Each source opens on PubMed, DailyMed or the publisher's page. Under each one are the exact words from it that this page relies on, copied word for word and checked against the original.

  1. Current status and future directions in food protein-induced enterocolitis syndrome: An NIAID workshop report of the June 22, 2022, virtual meeting. Nowak-Wegrzyn A, J Allergy Clin Immunol, 2025. Review Expert review
    The words this page rests on
    Food protein-induced enterocolitis syndrome (FPIES) is a non-IgE-mediated gastrointestinal food allergy characterized by delayed, protracted vomiting and accompanied by lethargy and pallor, usually 1 to 4 hours after ingesting the food allergen.
  2. International consensus guidelines for the diagnosis and management of food protein-induced enterocolitis syndrome: Executive summary-Workgroup Report of the Adverse Reactions to Foods Committee, American Academy of Allergy, Asthma & Immunology. Nowak-Węgrzyn A, J Allergy Clin Immunol, 2017. E2Good Consensus statement
    The words this page rests on
    Food protein-induced enterocolitis (FPIES) is a non-IgE cell- mediated food allergy that can be severe and lead to shock. Despite the potential seriousness of reactions, awareness of FPIES is low; high-quality studies providing insight into the pathophysiology, diagnosis, and management are lacking; and clinical outcomes are poorly established.
    This consensus document is the result of work done by an international workgroup convened through the Adverse Reactions to Foods Committee of the American Academy of Allergy, Asthma & Immunology and the International FPIES Association advocacy group. These are the first international evidence-based guidelines to improve the diagnosis and management of patients with FPIES.
  3. The prevalence and natural course of food protein-induced enterocolitis syndrome to cow's milk: a large-scale, prospective population-based study. Katz Y, J Allergy Clin Immunol, 2011. E2Good Observational study
    The words this page rests on
    All patients had FPIES within the first 6 months of life. By the age of 3 years, 90% of the patients had recovered.
    The prevalence of FPIES is significant, and its clinical presentation is distinct from that of IgE-CMA. Most patients with FPIES recover, although a proportion might convert to IgE-CMA.
    The cumulative incidence for FPIES was 0.34% (44/13,019 patients).
  4. Food protein-induced enterocolitis syndrome: 16-year experience. Mehr S, Pediatrics, 2009. E2Good Observational study
    The words this page rests on
    In the 66 episodes, vomiting was the most common clinical feature (100%), followed by lethargy (85%), pallor (67%), and diarrhea (24%).
  5. Guidelines for the diagnosis and management of food allergy in the United States: report of the NIAID-sponsored expert panel. NIAID-Sponsored Expert Panel, J Allergy Clin Immunol, 2010. E2Good Guideline
    The words this page rests on
    The Guidelines include a consensus definition for food allergy, discuss comorbid conditions often associated with food allergy, and focus on both IgE-mediated and non-IgE-mediated reactions to food.