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PubMed This is a summary of 69 peer-reviewed journal articles Updated

Cyclic Vomiting Syndrome: A Patient Guide

At a Glance

Cyclic vomiting syndrome causes repeated attacks of severe nausea and vomiting, usually followed by periods of near-normal health. Preventive treatment, early rescue medicine, trigger tracking, and an emergency plan can reduce the impact of attacks.

Cyclic Vomiting Syndrome (CVS) is a complex condition that can feel overwhelming for both those living with it and their families. It is characterized by sudden, repeated episodes of severe nausea and vomiting that can last for hours or days, separated by periods where you return toward your baseline health [1][2]. While it may look like a stomach bug or food poisoning, CVS is recognized as a disorder of gut-brain interaction [3][4]. This means it causes real, intense gastrointestinal symptoms, but the underlying issue involves how the nervous system and the digestive tract communicate.

This “brain-gut” connection explains why CVS is so closely related to migraines. Many doctors consider it part of the migraine spectrum, as both conditions involve a nervous system that is highly sensitive to triggers like stress, lack of sleep, or physical illness [5][6]. For many children, these episodes eventually evolve into traditional migraine headaches as they get older, suggesting a strong biological association between the two [5].

Understanding the predictable phases of an attack is the first step toward regaining a sense of control. Most episodes begin with a prodrome, a warning period where you might feel intense nausea, anxiety, or abdominal pain [7][8]. This is followed by the emetic phase, characterized by repetitive vomiting and extreme exhaustion, before moving into a recovery period where energy and appetite slowly return [9][10]. Between these attacks, you return to your baseline health—though some people may still experience mild interepisodic nausea—which is a hallmark of the condition [1].

Managing CVS requires a three-pronged strategy designed to protect your quality of life. First, prevention (prophylaxis) involves daily medications or supplements, such as amitriptyline or mitochondrial supports like Coenzyme Q10, prescribed by your doctor to reduce how often attacks happen [11][12]. Second, abortive (rescue) treatments are taken at the very first sign of the prodrome to try and stop the vomiting before it starts [11]. Finally, because episodes can sometimes be severe enough to cause dehydration, having a pre-written emergency protocol from your care team ensures that hospital staff communicate effectively and provide appropriate IV fluids and medications safely [11][13].

Living with CVS is challenging because of its unpredictability, but it is a manageable condition. By working with a care team that understands the gut-brain connection and having a clear plan for every phase, you can reduce the impact of the episodes and focus on the periods of health in between [3][11].

In this guide

6 chapters

01

Understanding Cyclic Vomiting Syndrome: An Overview

Learn what cyclic vomiting syndrome is, how its four phases unfold, common triggers, migraine links, emotional effects, and how episodes can be managed safely.

02

CVS Symptoms & Emergency Warning Signs

Learn about cyclic vomiting syndrome phases, dehydration and electrolyte warning signs, and when vomiting, bleeding, pain, or heart symptoms require emergency care

03

The Biology of CVS and Similar Conditions

Learn how cyclic vomiting syndrome links the gut-brain axis to migraines, mitochondria, and the autonomic system—and how it differs from CHS and similar conditions.

04

How CVS is Diagnosed: Essential Testing

Learn how cyclic vomiting syndrome is diagnosed, including Rome IV criteria, blood and urine tests, imaging, endoscopy, and when metabolic testing is needed.

05

Standard Treatments and Emergency Care for CVS

Learn how cyclic vomiting syndrome is treated with preventive medicines, rescue medications, IV fluids, and an emergency protocol for severe vomiting attacks.

06

Living with CVS: Triggers and the Long-Term Journey

Learn how to manage cyclic vomiting syndrome triggers, protect mental health, track patterns, find school or work support, and understand the long-term outlook.

Common questions in this guide

What is cyclic vomiting syndrome, and how is it different from a stomach bug?
Cyclic vomiting syndrome is a disorder of gut-brain interaction that causes sudden, repeated attacks of severe nausea and vomiting. The attacks can last for hours or days and are separated by periods of returning toward normal health, rather than being a single illness that simply runs its course.
What happens during a cyclic vomiting syndrome episode?
An episode often has a warning phase with nausea, anxiety, or abdominal pain, followed by repetitive vomiting and exhaustion, then gradual recovery of energy and appetite. Some people have mild nausea between attacks.
What can trigger cyclic vomiting syndrome attacks?
Stress, too little sleep, and physical illness can trigger attacks in people with cyclic vomiting syndrome. Tracking symptoms, sleep, meals, stress, and possible triggers can help your care team tailor a prevention plan.
When should I take rescue medicine for cyclic vomiting syndrome?
Rescue medicine is generally used at the earliest sign of the warning phase, before repeated vomiting begins, but the exact timing and medicines should come from your clinician's written plan. Follow that plan rather than changing doses on your own.
How is cyclic vomiting syndrome treated between attacks?
Prevention may include a daily medicine such as amitriptyline or a supplement such as Coenzyme Q10, prescribed by a clinician to reduce attacks. The plan may also include lifestyle measures and symptom tracking, while rescue treatments are used when an episode starts.
Why should I have an emergency plan for cyclic vomiting syndrome?
Severe episodes can cause dehydration and may require intravenous fluids and medicines in the hospital. A written plan or letter from your care team helps emergency staff understand the condition and provide appropriate treatment safely.
Is cyclic vomiting syndrome related to migraines?
Yes. Cyclic vomiting syndrome is often considered part of the migraine spectrum because both can involve sensitivity to triggers such as stress, poor sleep, or illness. Some children with cyclic vomiting syndrome later develop typical migraine headaches.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on our family history of migraines, does that influence how we should approach my/my child's treatment?
  2. 2.Can we develop a written 'rescue plan' for me to keep at home and a letter to give to doctors in the emergency room?
  3. 3.What is the best way to track our symptoms and potential triggers to see if our prevention strategy is working?
  4. 4.At what point during the prodrome phase should we start our rescue medications to be most effective?
  5. 5.Are there specific lifestyle changes, such as sleep or meal timing, that you recommend to help stabilize the gut-brain axis?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (13)
  1. 1

    Cyclic vomiting syndrome: diagnostic approach and current management strategies.

    Hayes WJ, VanGilder D, Berendse J, et al.

    Clinical and experimental gastroenterology 2018; (11()):77-84 doi:10.2147/CEG.S136420.

    PMID: 29520160
  2. 2

    Symptom Patterns in Adults With Cyclic Vomiting Syndrome: A 6-Month Prospective Observational Study.

    Chen YJ, Rodriguez D, Richmond CA, et al.

    Neurogastroenterology and motility 2025; (37(2)):e14974 doi:10.1111/nmo.14974.

    PMID: 39737520
  3. 3

    Cyclic vomiting syndrome: A narrative review and guide to management.

    Kovacic K, Li BUK

    Headache 2021; (61(2)):231-243 doi:10.1111/head.14073.

    PMID: 33619730
  4. 4

    Cyclic Vomiting Syndrome is characterized by altered functional brain connectivity of the insular cortex: A cross-comparison with migraine and healthy adults.

    Ellingsen DM, Garcia RG, Lee J, et al.

    Neurogastroenterology and motility 2017; (29(6)) doi:10.1111/nmo.13004.

    PMID: 27910222
  5. 5

    Cyclic vomiting syndrome and benign paroxysmal torticollis are associated with a high risk of developing primary headache: A longitudinal study.

    Moavero R, Papetti L, Bernucci MC, et al.

    Cephalalgia : an international journal of headache 2019; (39(10)):1236-1240 doi:10.1177/0333102419844542.

    PMID: 30982347
  6. 6

    Evidence-based review and frontiers of migraine therapy.

    Greene KA, Gelfand AA, Larry Charleston

    Neurogastroenterology and motility 2025; (37(3)):e14899 doi:10.1111/nmo.14899.

    PMID: 39133210
  7. 7

    Understanding the adult and adolescent patient experience with cyclic vomiting syndrome: a concept elicitation study.

    Karrento K, Wu M, Rodriguez D, et al.

    BMC gastroenterology 2025; (25(1)):85 doi:10.1186/s12876-025-03595-7.

    PMID: 39962369
  8. 8

    Cyclic Vomiting Syndrome in Adults and Children: A Hypothesis.

    Redon S, Mareau C, Guedj E, Donnet A

    Headache 2017; (57(6)):943-951 doi:10.1111/head.13108.

    PMID: 28488756
  9. 9

    [Clinical and gastroscopic features of children with cyclic vomiting syndrome: an analysis of 63 cases].

    Song L, Li YJ, Wang J, et al.

    Zhongguo dang dai er ke za zhi = Chinese journal of contemporary pediatrics 2022; (24(12)):1340-1344 doi:10.7499/j.issn.1008-8830.2206007.

    PMID: 36544416
  10. 10

    Managing cyclic vomiting syndrome in children: beyond the guidelines.

    Li BUK

    European journal of pediatrics 2018; (177(10)):1435-1442 doi:10.1007/s00431-018-3218-7.

    PMID: 30076469
  11. 11

    Guidelines on management of cyclic vomiting syndrome in adults by the American Neurogastroenterology and Motility Society and the Cyclic Vomiting Syndrome Association.

    Venkatesan T, Levinthal DJ, Tarbell SE, et al.

    Neurogastroenterology and motility 2019; (31 Suppl 2()):e13604 doi:10.1111/nmo.13604.

    PMID: 31241819
  12. 12

    Management of cyclic vomiting syndrome in adults: Evidence review.

    Sharaf RN, Venkatesan T, Shah R, et al.

    Neurogastroenterology and motility 2019; (31 Suppl 2()):e13605 doi:10.1111/nmo.13605.

    PMID: 31241818
  13. 13

    Development and Assessment of a Low Literacy, Pictographic Cyclic Vomiting Syndrome Action Plan.

    Reeves PT, Kovacic K, Rogers PL, et al.

    The Journal of pediatrics 2022; (242()):174-183.e1 doi:10.1016/j.jpeds.2021.10.047.

    PMID: 34740589

This page is for informational purposes only and does not constitute medical advice. Your healthcare team should tailor any cyclic vomiting syndrome prevention, rescue, and emergency plan to your needs.

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