About the Rome IV Criteria for Functional Nausea and Functional Vomiting in Children
Two separate disorders sharing a two-month duration rule and an exclusion clause. Functional nausea (H1b1) requires bothersome nausea as the predominant symptom, occurring at least twice per week and generally not related to meals, and not consistently associated with vomiting. Functional vomiting (H1b2) requires on average one or more episodes of vomiting per week, with no self-induced vomiting and with criteria for an eating disorder or rumination not met. Both require that after appropriate evaluation the symptoms cannot be fully explained by another medical condition. A child can meet one, the other, or both — Rome IV separated them precisely so that a child with disabling nausea and no vomiting has a diagnosis.
Formula
Shared gate = ≥ 2 months AND another medical condition excluded after appropriate evaluation
H1b1 functional nausea = shared gate
AND bothersome nausea predominant, ≥ 2×/week, generally not meal-related
AND not consistently associated with vomiting
H1b2 functional vomiting = shared gate
AND ≥ 1 episode of vomiting per week on average
AND no self-induced vomiting, and criteria for eating disorder or rumination not met
Both may be met simultaneously.- Predominant
- Nausea has to be the leading symptom, not one of several. A child whose main complaint is abdominal pain with some nausea belongs in the abdominal pain chapter.
- Generally not related to meals
- The boundary with functional dyspepsia. Postprandial nausea clustering after eating points to postprandial distress syndrome instead.
- Not consistently associated with vomiting
- Occasional vomiting does not disqualify functional nausea; a reliable nausea-then-vomiting sequence does.
- Two months in both disorders, against three months for the adult equivalent.
- Rome IV merged chronic idiopathic nausea and functional vomiting into one adult syndrome but kept them separate in children.
- A child can carry both diagnoses at once — the criteria are written so that this is explicit rather than ambiguous.
- The rumination exclusion is why asking about retching belongs in every one of these assessments.
Interpreting the result
Give the diagnosis by name and give it early. Children and families do markedly better when told what the condition is than when told that the tests were normal, and the difference is not cosmetic — an unnamed symptom invites further testing, and further testing entrenches illness behaviour. Address school attendance in the first consultation, before it has become the dominant problem: a graded return plan negotiated with the school is usually more valuable than any drug, and the goal is function rather than symptom elimination, because function generally recovers first. Cognitive behavioural therapy and gut-directed hypnotherapy have good paediatric trial evidence in functional gastrointestinal disorders and are appropriate here. Check a lying and standing heart rate in adolescents, since orthostatic intolerance commonly coexists and is treatable with hydration, salt and graded exercise. Where criteria are not met, the pattern usually points somewhere specific: episodic vomiting with complete wellness in between is cyclic vomiting syndrome, postprandial nausea clustering after meals is functional dyspepsia, effortless regurgitation without retching is rumination, and self-induced vomiting redirects the assessment entirely.
| Score | Band | What it means | Action |
|---|---|---|---|
| H1b1 — Functional nausea | Functional nausea | Bothersome nausea at least twice weekly, predominant, not consistently followed by vomiting | Name the diagnosis; prioritise school attendance; consider CBT or hypnotherapy; check for orthostatic intolerance |
| H1b2 — Functional vomiting | Functional vomiting | Vomiting at least weekly on average, not self-induced, not rumination | Same approach; confirm the absence of retching and screen for disordered eating |
| Both disorders met | Functional nausea and functional vomiting | Criteria for both are satisfied | Rome IV permits both diagnoses; management is the same and does not require choosing between them |
| Criteria not met | Criteria not met | Duration, frequency or exclusion criteria unsatisfied, or a different pattern fits better | Consider cyclic vomiting, functional dyspepsia, rumination or an eating disorder |
What the Functional Nausea & Vomiting (Children) needs (6 inputs)
- Criteria fulfilled for at least 2 months prior to diagnosis
- Two months, applying to both disorders. The paediatric committees shortened every duration rule relative to the adult criteria, on the basis that waiting is itself harmful in a child missing school.
- Bothersome nausea as the predominant symptom, at least twice per week, generally not meal-related
- Functional nausea criterion. 'Generally not related to meals' is the phrase separating it from functional dyspepsia, where symptoms cluster around eating.
- Nausea not consistently associated with vomiting
- Functional nausea criterion. Nausea that reliably ends in vomiting belongs to a vomiting disorder instead.
- On average, one or more episodes of vomiting per week
- Functional vomiting criterion. A weekly average rather than a fixed count, which accommodates clustering.
- No self-induced vomiting; criteria for an eating disorder or rumination not met
- Functional vomiting criterion. Self-induced vomiting is an eating-disorder question rather than a gastroenterological one, and rumination is excluded by the absence of retching.
- After appropriate evaluation, the symptoms cannot be fully explained by another medical condition
- Shared by both disorders. What counts as appropriate evaluation is not specified and is left to clinical judgement.
What it returns
- Functional nausea — met or not met
- Duration, predominance and frequency, dissociation from vomiting, and exclusion.
- Functional vomiting — met or not met
- Duration, weekly frequency, absence of self-induction and of rumination or an eating disorder, and exclusion.
- Whether both are present
- Rome IV permits this explicitly — they are independent diagnoses rather than alternatives.
How it is calculated
Nausea and vomiting are generated by convergent inputs onto brainstem circuitry: vagal afferents from the gut, vestibular input, the area postrema responding to circulating stimuli, and descending cortical and limbic influence. Functional nausea and vomiting reflect altered processing somewhere along that pathway rather than a structural or motility abnormality, and the balance of contributions differs between children — which is why a single treatment does not work for everyone. Two features of the paediatric picture are worth holding onto. Nausea and vomiting frequently dissociate: the circuitry that generates the sensation and the circuitry that produces the motor act are not the same, so a child can have severe unremitting nausea with no vomiting at all, and Rome IV's decision to define them separately follows directly from that. And autonomic contributions are common in adolescents, with orthostatic intolerance and postural tachycardia frequently coexisting — worth checking with a lying and standing heart rate, which costs nothing and occasionally reframes the whole presentation.
Facts & figures
| Pattern | Diagnosis | Discriminating feature |
|---|---|---|
| Continuous nausea, little or no vomiting | Functional nausea (H1b1) | Nausea predominant and not consistently followed by vomiting |
| Weekly vomiting, not self-induced | Functional vomiting (H1b2) | No retching-free regurgitation, no eating disorder |
| Discrete severe episodes, well in between | Cyclic vomiting syndrome | Return to baseline between stereotypical episodes |
| Nausea clustering after meals with fullness | Functional dyspepsia — PDS | Meal-related timing |
| Effortless regurgitation minutes after eating | Rumination syndrome | Not preceded by retching; never during sleep |
| Self-induced vomiting | Eating disorder | Redirects the assessment entirely |
Timing relative to meals, and what happens between episodes, do almost all of the discriminating work in this chapter.
Evidence
Derivation — Rome Foundation, child/adolescent committee
2016Consensus criteria from the Rome IV committee on childhood functional gastrointestinal disorders in the child and adolescent age band, published in Gastroenterology in 2016.
Consensus-derived. The notable structural choice was to keep functional nausea and functional vomiting as separate paediatric disorders, where the adult chapter merged the equivalent categories into a single syndrome.
Randomised trial — gut-directed hypnotherapy
2007Randomised controlled trial of gut-directed hypnotherapy in children with functional abdominal pain or irritable bowel syndrome, reported by Vlieger and colleagues in 2007, with long-term follow-up published subsequently.
Hypnotherapy was substantially more effective than standard medical care, with benefit sustained at long-term follow-up — the strongest paediatric evidence for a psychological intervention in functional gastrointestinal disorders.
Randomised trial — home-based hypnotherapy
2017Randomised comparison of home-based hypnotherapy self-exercises against individual hypnotherapy with a therapist in paediatric IBS and functional abdominal pain, reported by Rutten and colleagues in 2017.
Home-based self-exercises were non-inferior to therapist-delivered hypnotherapy on the primary outcome, which materially improves access where therapist time is limited.
How it compares
Functional Nausea & Vomiting (Children) vs Chronic nausea and vomiting syndrome
The adult chapter merged these two into one syndrome; the paediatric chapter deliberately kept them apart.
Rome IV's adult gastroduodenal committee combined chronic idiopathic nausea and functional vomiting into a single entity with an OR-structured entry criterion, so nausea alone or vomiting alone qualifies. The paediatric committee kept two separate disorders. The practical consequence is that a child can carry a diagnosis of functional nausea specifically, which matters because nausea without vomiting is a recognisable and severely disabling presentation that risks having no name at all if it is only ever a component of a vomiting syndrome.
Functional Nausea & Vomiting (Children) vs Paediatric cyclic vomiting syndrome
Episodic with complete wellness in between, versus continuous — the question is what happens between episodes.
Cyclic vomiting requires stereotypical episodes separated by weeks to months with return to baseline health. Functional vomiting is a weekly average without that architecture. Severity does not distinguish them: a child with cyclic vomiting is often far more unwell during an attack than a child with functional vomiting ever is, and entirely normal in between. Asking how the child is between episodes is the single most useful question and is often skipped because the episodes dominate the history.
Functional Nausea & Vomiting (Children) vs Paediatric functional dyspepsia
Timing relative to meals is the boundary — postprandial nausea belongs to dyspepsia, not to functional nausea.
Rome IV writes 'generally not related to meals' into the functional nausea criteria specifically to draw this line. Postprandial distress syndrome, a subtype of functional dyspepsia, lists postprandial nausea among its supportive features, so a child whose nausea clusters after eating alongside fullness or early satiation belongs there. The distinction is worth making because the dietary and prokinetic approaches used in postprandial distress do not transfer to functional nausea.
Pearls & pitfalls
- Address school attendance at the first consultation. Time out of school is the strongest predictor of a poor outcome and is much harder to reverse than the nausea.
- Nausea and vomiting dissociate — a child can have disabling nausea with no vomiting at all, and Rome IV gives that child a diagnosis deliberately.
- Ask about retching in every case; effortless regurgitation without it is rumination, not vomiting.
- Check a lying and standing heart rate in adolescents — orthostatic intolerance frequently coexists and is treatable.
- Meal-related nausea points to functional dyspepsia rather than functional nausea.
- Episodic vomiting with complete wellness in between is cyclic vomiting syndrome, not functional vomiting.
- Both diagnoses can be made at once; there is no need to choose.
- Give the diagnosis by name. 'The tests were normal' invites more tests; a named condition does not.
- Screen for disordered eating, particularly where vomiting is the dominant symptom.
- Gut-directed hypnotherapy has good paediatric trial evidence, and home-based self-exercises were non-inferior to therapist-delivered sessions.
Critical actions
- Establish whether nausea or vomiting predominates, and whether they occur together consistently.
- Ask about timing relative to meals.
- Ask about retching, and about whether anything is ever brought up effortlessly and rechewed.
- Ask directly about self-induced vomiting and screen for disordered eating.
- Measure lying and standing heart rate and blood pressure in adolescents.
- Quantify school absence explicitly, in days, and start a graded return plan.
- Give the diagnosis by name and explain it, rather than reporting normal results.
- Refer for cognitive behavioural therapy or gut-directed hypnotherapy where available.
- Avoid repeating investigations that have already been done without new indications.
Why this score exists
The paediatric committee went the opposite way to the adult one here, and the divergence is deliberate. Rome IV merged chronic idiopathic nausea and functional vomiting into a single adult syndrome, reasoning that they overlap heavily and that separating them served little purpose. The child and adolescent committee kept them apart. The reason is that in children the dissociation is more consequential: a child with severe unremitting nausea and no vomiting is a familiar clinical picture, is profoundly disabled by it, and — if nausea is only ever a prelude to a vomiting disorder — has no diagnosis at all. Giving that child a named condition is not a taxonomic nicety; it is what allows the consultation to stop being about the next investigation. Two committees looking at the same pair of symptoms reached different conclusions because the cost of merging them was different in each population, which is a better argument for age-specific criteria than any amount of adjusting thresholds.
About the creator
First author, Rome IV child/adolescent functional gastrointestinal disorders committee
Chaired the committee that produced the child and adolescent criteria.
Co-author; paediatric neurogastroenterology and motility
Contributed to the Rome IV paediatric criteria and to much of the underlying motility literature.
Co-author; behavioural and psychosocial aspects of paediatric DGBIs
Contributed the psychosocial framing that underpins the recommended management.
Limitations
- Consensus criteria with no validation cohort; the twice-weekly and weekly thresholds are conventions rather than measured boundaries.
- 'Predominant' and 'bothersome' are judged rather than defined, and children may quantify neither reliably.
- 'Appropriate evaluation' is not specified, so how much investigation is expected before the diagnosis varies widely between clinicians.
- Symptom diaries are rarely kept, so the frequency criteria usually rest on recall.
- No severity grading, and severity is what determines school absence and disability rather than frequency.
- The criteria say nothing about orthostatic intolerance, which commonly coexists in adolescents and is treatable.
- The eating-disorder exclusion is named but not operationalised.
- Nothing addresses the school and family context, which does more to determine outcome than the symptom itself.
If you are the patient
Feeling sick a lot, or being sick regularly, without any disease being found is a recognised condition — in fact two of them, depending on which is the bigger problem. If the main issue is constant nausea, with little or no actual vomiting, that is called functional nausea. If the main issue is vomiting around once a week or more, that is functional vomiting. Some people have both, which is fine and does not need sorting out into one or the other. It is a real condition and not something imagined. What happens is that the parts of the brain and nerves that create the feeling of sickness become oversensitive, in much the same way that a pain system can become oversensitive. Nothing is damaged, and nothing is getting worse, but the signal is turned up. The most important thing, and the thing most worth acting on early, is school. It is very tempting to stay home while feeling sick, and completely understandable — but the longer the gap, the harder returning becomes, and eventually the return itself becomes the bigger problem. Doctors will usually push for a gradual, planned return rather than waiting until the sickness has gone, because in practice the ability to get on with things comes back before the symptom does. Treatments that help include a talking therapy called CBT, and gut-directed hypnotherapy, which has good evidence in children and can be done partly at home. Teenagers are often checked for dizziness on standing, since a related circulation problem is common and is helped by drinking more, adding salt and building up exercise.
Frequently asked questions
What are the Rome IV criteria for functional nausea in children?#
Bothersome nausea as the predominant symptom occurring at least twice per week and generally not related to meals; not consistently associated with vomiting; and, after appropriate evaluation, not fully explained by another medical condition — all fulfilled for at least two months prior to diagnosis.
What are the Rome IV criteria for functional vomiting in children?#
On average one or more episodes of vomiting per week; absence of self-induced vomiting and of criteria for an eating disorder or rumination; and, after appropriate evaluation, not fully explained by another medical condition — all for at least two months.
Can a child have both disorders?#
Yes, and Rome IV writes them so that this is explicit. They are independent diagnoses rather than alternatives, and management is the same either way, so there is no need to force a choice between them.
Why did the paediatric criteria keep these separate when the adult ones merged them?#
Because the cost of merging differs by population. In children, severe nausea without vomiting is a common and profoundly disabling presentation, and folding it into a vomiting syndrome would leave those children without a diagnosis. The adult committee judged the overlap large enough to justify a single syndrome; the paediatric committee judged the dissociation important enough to keep two.
Why does school attendance matter so much?#
Because time out of school is the strongest predictor of a poor outcome, and it compounds. A child absent for a term faces academic and social re-entry difficulties on top of the original symptom, and those become harder to solve than the nausea. Addressing attendance at the first consultation, with a graded return plan, is more valuable than most drug treatments.
What treatments have evidence in children?#
Gut-directed hypnotherapy has the strongest paediatric trial evidence in functional gastrointestinal disorders, with benefit sustained at long-term follow-up, and home-based self-exercises were found non-inferior to therapist-delivered sessions — which matters where therapist time is scarce. Cognitive behavioural therapy is a reasonable alternative where hypnotherapy is unavailable. The goal is restored function rather than symptom elimination.
What should be excluded first?#
Rumination, by asking about retching — effortless regurgitation without retching is a different disorder. Cyclic vomiting, by asking whether the child is completely well between episodes. Functional dyspepsia, by asking about timing relative to meals. And an eating disorder, by asking directly about self-induced vomiting, ideally with part of the consultation conducted without a parent present.
Why check the heart rate lying and standing?#
Because orthostatic intolerance and postural tachycardia frequently coexist with chronic nausea in adolescents, are not mentioned in the Rome IV criteria, and are treatable with hydration, increased salt intake and graded exercise. The test costs nothing and occasionally reframes the entire presentation.
References
Original / primary reference
Treatment evidence
- Vlieger AM, Menko-Frankenhuis C, Wolfkamp SCS, Tromp E, Benninga MA. Hypnotherapy for Children With Functional Abdominal Pain or Irritable Bowel Syndrome: A Randomized Controlled Trial. Gastroenterology. 2007;133(5):1430-1436.
- Rutten JMTM, Vlieger AM, Frankenhuis C, George EK, Groeneweg M, Norbruis OF, et al. Home-Based Hypnotherapy Self-exercises vs Individual Hypnotherapy With a Therapist for Treatment of Pediatric Irritable Bowel Syndrome, Functional Abdominal Pain, or Functional Abdominal Pain Syndrome: A Randomized Clinical Trial. JAMA Pediatr. 2017;171(5):470-477.