hiccups
Enable an AI agent to recognise a reported or observed hiccup episode, assess its course and impact, and identify what observation, support or further assessment may be appropriate.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a reported or observed hiccup episode, assess its course and impact, and identify what observation, support or further assessment may be appropriate.
Hiccups (singultus) are stereotyped involuntary inspiratory myoclonic contractions of the diaphragm and intercostal muscles, immediately followed by glottic closure that interrupts airflow and produces the 'hic' sound, generated by a reflex arc whose afferents run in the phrenic and vagus nerves and T6-T12 sympathetics and whose putative centre lies in the medulla and C3-C5 cord.
It can be Characterise a suspected hiccup event and record uncertainty when competing explanations remain.; Track episode duration, frequency, pauses and recurrence using explicit observation windows.; Compare episodes for repeated associations with meals, activities or other contextual changes.; Summarise interference and accompanying symptoms for a person or clinician assessing the episode.; Record attempted actions and their outcomes without treating a single apparent response as proof of efficacy.; Apply an explicitly sourced assessment policy to the recorded duration, burden and accompanying symptoms, or flag that the policy is missing..
Distinguishing features
Determine whether the event includes an abrupt involuntary inspiratory jerk with a characteristic catch or 'hic'; record which components were reported or observed.
Distinguish the inspiratory catch from an expulsive cough; sound alone may leave the event uncertain.
Distinguish the jerk-and-catch event from a belch dominated by release of gas, while allowing both events to occur together.
Distinguish hiccups from retching or vomiting by recording whether retching movements or expulsion of stomach contents occur as separate accompanying events.
Distinguish individual hiccups from a sustained breathing disturbance; record accompanying breathing difficulty separately rather than assuming hiccups explain it.
Scope
+ Reported or observed hiccup events and the evidence supporting their identification
+ Grouping events into episodes, including interruptions and recurrence
+ Episode timing, event frequency and changes in pattern
+ Possible triggers, associated symptoms and relevant contextual changes
+ Effects on eating, drinking, sleeping, breathing, speaking and daily activity
+ Actions attempted, observed responses and assessment status
- Diagnosis and management of diseases that may underlie hiccups
- Complete models of coughing, belching, sneezing, reflux or vomiting
- General respiratory physiology and unrelated breathing disorders
- Medication prescribing, dosing and comprehensive medication records
- The person's complete medical history or overall functional status
Characteristics
- Recognition evidence
- Person's report; witness report; direct observation; audio or video; clinical assessment; recognition uncertain Separates a named complaint from evidence that the observed events are hiccups.
- Observed event components
- Inspiratory jerk; audible catch; visible chest or abdominal movement; components absent or unobserved Supports recognition without requiring every event to be audible or directly witnessed.
- Episode duration
- Minutes, hours or days from reported onset to cessation or latest observation, with uncertainty Makes sustained episodes distinguishable from brief bouts and avoids treating an ongoing duration as final.
- Hiccup frequency
- Events per minute over a stated observation window; range if variable Describes event density independently of how long the episode has lasted.
- Episode course
- Ongoing; intermittent; apparently ceased; recurred; current state unknown Allows an agent to distinguish temporary pauses from observed cessation and later recurrence.
- Hiccup-free intervals
- Minutes, hours or days, distinguishing observed absence from missing observation Supports defensible episode boundaries.
- Possible precipitant
- Time-linked meal, drink, activity, procedure, medication change or other event; suspected, repeatedly associated or clinically attributed Preserves useful context without converting temporal association into a causal conclusion.
- Associated symptoms
- Linked symptom observations with onset, severity and timing relative to hiccups Keeps symptoms requiring separate attention visible.
- Functional interference
- For eating, drinking, sleeping, speaking, breathing and activity: none reported; disrupted; prevented; unknown Captures consequences that event count and duration alone cannot express.
- Response to an attempted action
- No observed change; reduced frequency; temporary cessation; sustained cessation during follow-up; worsened; adverse effect; unclear Records outcomes while allowing for spontaneous resolution and incomplete follow-up.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 16 findings · 26 questions.
Hiccup recognition Establish what was experienced or observed and how securely it can be identified as hiccups.
A person's label or a short sound recording may not distinguish hiccups from neighbouring events.
Jerk and catch
Capture the event components that support recognition.
Event signature
Record the abrupt inspiratory movement, associated catch or sound, and whether the event felt involuntary.
- What inspiratory jerk, catch, sound or visible movement was present during the suspected hiccup? definition
- Who observed or reported these components, and through what observation method? provenance
Neighbouring events
Resolve or preserve ambiguity with coughs, belches, retching and other movements.
Alternative event check
Keep competing event identities and separately occurring symptoms explicit.
- What distinguishes the event from coughing, belching, retching or another involuntary movement in this observation? boundary
- Are these other events occurring alongside recognisable hiccups, or does their presence leave the hiccup identification uncertain? boundary
Episode course Describe how individual hiccups form bouts and how those bouts continue, pause or recur.
The same event frequency can occur in a brief bout or a prolonged problem, with different implications for assessment.
Onset and boundaries
Anchor episode timing and distinguish a pause from a new episode.
Episode continuity
Represent onset, latest activity and hiccup-free intervals without filling gaps in observation.
- When did this episode begin, when was the latest hiccup, and how certain are those times? measurement
- What hiccup-free interval supports treating later events as a recurrence rather than continuation, and was that interval observed or assumed? boundary
Frequency and variation
Track event density and its changes within and between bouts.
Measured hiccup pattern
Record counts and spacing within stated windows, including changes around sleep and waking when observed.
- How many hiccups occurred during a stated observation window, and how regular was their spacing? measurement
- How did frequency and pauses change across the episode, including any observed sleep period? measurement
Precipitants and associations Connect hiccup episodes to relevant circumstances while keeping suspected causes provisional.
Repeated contextual patterns can inform assessment, but temporal proximity alone does not establish why hiccups occurred.
Immediate context
Capture activities and exposures around onset or changes in frequency.
Onset-linked events
Record potentially relevant meals, drinks and activities, including their timing and recurrence.
- What eating, drinking or other activity immediately preceded onset or a marked change in hiccups? provenance
- Has the same sequence occurred in other episodes, and has that activity also occurred without hiccups? boundary
Clinical context
Link relevant health changes without embedding an underlying disease model.
Health-change associations
Preserve the timing and attribution of associated symptoms, illnesses, procedures and medication changes.
- Which symptoms, illnesses, procedures or medication changes preceded or accompanied this episode, and by how long? provenance
- Is any proposed cause a person's suspicion, a repeated association or a documented clinical assessment? provenance
Burden and response Represent the practical consequences of hiccups and the evidence available for choosing or evaluating a next action.
An episode's significance depends on functional interference, accompanying symptoms and its course after attempted actions.
Interference and assessment
Make disruption and any need for further assessment explicit.
Episode impact
Record what hiccups interrupt or prevent, with accompanying symptoms evaluated separately.
- How are hiccups affecting eating, drinking, sleeping, speaking, breathing and usual activities? measurement
- What accompanying symptoms or consequences require separate assessment rather than attribution to hiccups? boundary
- Under the applicable sourced guidance, do the episode's duration, interference or accompanying symptoms warrant further assessment? action
Attempts and follow-up
Track actions already taken and distinguish immediate changes from sustained outcomes.
Observed action response
Connect each attempted measure to its timing, observed benefit or harm, and subsequent recurrence.
- What action was attempted, when was it attempted, and what was its recommendation source? provenance
- What changed in hiccup frequency, interference or adverse symptoms afterward, and for how long was the outcome observed? measurement
- What follow-up observation or assessment is needed before treating the episode as resolved or deciding on another action? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Acute (transient) hiccups lasting less than 48 hours, almost always self-limited
- Persistent hiccups lasting from 48 hours to one month
- Intractable (chronic) hiccups lasting more than one month
- Recurrent hiccups: repeated bouts separated by quiet intervals
- Fetal hiccups, common in utero and sometimes felt by the pregnant person
- Drug-induced hiccups, especially with dexamethasone, platinum chemotherapy, benzodiazepines and opioids
- Postoperative and intra-anesthetic hiccups, including during endoscopy sedation
- Psychogenic hiccups diagnosed only after organic causes along the reflex arc have been excluded
- Which of these kinds and varieties hold for the sense of hiccups this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q58952 - Item for hiccup / singultus as a medical sign.
- ICD-10-CM - R06.6 - Hiccough, under symptoms and signs involving the circulatory and respiratory systems; index terms include hiccup and singultus.
- ICD-11 MMS - MD11.6 - Hiccough; ICD-11 Foundation id 798509501.
- ICD-9-CM - 786.8 - Hiccough (historical coding).
- MeSH - D006606 - Descriptor Hiccup; tree C23.888.821.578.
- UMLS CUI - C0019521 - Hiccup as a finding.
- SNOMED CT - 716771000 - Chronic hiccup / chronic hiccough (also mapped from MedGen C0744898).
- SNOMED CT - 1119237008 - Recurrent hiccup / recurrent singultus.
- HPO - HP:0100247 - Recurrent singultus.
- Orphanet - ORPHA396 - Chronic hiccup as a rare disorder.
- MONDO - MONDO:0018334 - Chronic hiccup.
- MedlinePlus - 003068 - Consumer topic Hiccups.
- NCI Thesaurus - C37966 - Hiccough.
- MedDRA - 10020037 - Hiccups preferred term.
- Which of these identifiers and schemes hold for the sense of hiccups this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- WHO ICD-10 R06.6 and ICD-11 MD11.6 classify hiccough as a coded symptom, not as a disease entity (World Health Organization).
- Chlorpromazine remains the only medicine approved by the U.S. Food and Drug Administration specifically for hiccups; other agents are off-label (StatPearls, citing FDA labelling).
- No dedicated WHO, NICE or specialty-society clinical practice guideline exists; the 48-hour and 1-month duration cut-offs are widely used convention rather than a formal standard (StatPearls).
- In oncology trials, hiccups are graded as an adverse event under Common Terminology Criteria for Adverse Events (CTCAE / NCI).
- Orphanet lists chronic hiccup (ORPHA396) as a rare disorder for orphan-disease cataloguing, not as a treatment standard.
- Which of these standards and regulation hold for the sense of hiccups this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Almost universal short bouts after gastric distension (large meal, carbonated drink, alcohol) or a sudden temperature change, usually ignored and untreated.
- Fetal hiccups are commonly felt in pregnancy and observed on obstetric ultrasound as rhythmic fetal diaphragmatic movement.
- Primary-care and emergency presentation when a bout lasts beyond about two days, triggering a search for GERD, drugs, metabolic disturbance or a lesion on the reflex arc.
- Oncology and palliative care: hiccups in a substantial minority of people on cisplatin/oxaliplatin with dexamethasone, and in about 4-9% of people with advanced cancer, interfering with eating and sleep.
- Intraoperative and endoscopic sedation: hiccups during anaesthesia or gastric insufflation, including about one in five sedated gastrointestinal endoscopies.
- Neurology: persistent hiccups as a clue to lateral medullary infarction, neuromyelitis optica spectrum disorder (area postrema), or other brainstem disease.
- Intensive care: hiccups that desynchronise a ventilated patient.
- Self-help and folk manoeuvres (breath-holding, Valsalva, sipping cold water) plus commercial devices such as a forced-inspiratory suction-and-swallow straw.
- Which of these real-world use hold for the sense of hiccups this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Hiccup rate within a bout - 4-60 - cycles per minute
- Acute bout duration - seconds to <48 - hours
- Persistent episode duration - 2-30 - days
- Intractable episode duration - >30 days to years (longest published continuous case ~70 years) - days
- Glottic closure after diaphragmatic discharge - about 35 - milliseconds
- Hospital incidence of documented hiccups - about 55 - per 100000 admissions
- Hiccups among people with GERD - 8-10 - percent
- Hiccups among people receiving cisplatin plus dexamethasone - up to 42 - percent
- Which of these typical measurements hold for the sense of hiccups this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Persistent or intractable bouts disrupt sleep, speech, eating and social contact, and can cause dehydration, malnutrition, weight loss, exhaustion and depression.
- Acute bouts can cause aspiration and worsen reflux.
- In ventilated patients, hiccups desynchronise the ventilator and can cause respiratory compromise and haemodynamic instability.
- Forceful bouts can threaten fresh thoracic or abdominal wounds and have been linked to bradycardia, hypotension, barotrauma (pneumothorax or pneumomediastinum) and, rarely, carotid dissection.
- Treating the symptom while missing the cause can delay diagnosis of myocardial ischaemia, brainstem stroke, esophageal malignancy or subphrenic abscess.
- Pharmacologic treatment carries its own harms: chlorpromazine and other dopamine antagonists (sedation, extrapyramidal effects); metoclopramide (tardive dyskinesia with prolonged use).
- Phrenic-nerve or stellate-ganglion block can cause diaphragmatic paralysis, pneumothorax, recurrent-laryngeal-nerve injury or local-anaesthetic toxicity.
- Which of these failure modes and hazards hold for the sense of hiccups this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Everyday English splits between hiccups (especially North America) and hiccough (especially British medical and older usage); clinical literature uses singultus from Latin singult.
- No consistent racial or geographic difference in incidence is reported; intractable hiccups are more often described in older men (odds ratio about 2.4 in pooled case material).
- Acupuncture for post-stroke and cancer-associated hiccups is far more studied and used in East Asian practice than in typical Western pathways.
- U.S. practice is shaped by chlorpromazine's unique FDA indication; elsewhere baclofen, gabapentin and reflux therapy are often first-line without that regulatory anchor.
- Folk stopping manoeuvres (sugar, vinegar, scare, breath-hold, paper bag) vary by culture and are not standardised.
- Which of these regional variation hold for the sense of hiccups this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Cough - A cough is an expulsive forced expiration after glottic opening; a hiccup is an inspiratory diaphragmatic spasm terminated by abrupt glottic closure and a 'hic', not an expulsive blast.
- Belch (eructation) - A belch vents gastric gas through an open upper oesophageal sphincter; a hiccup is a stereotyped inspiratory myoclonus with glottic closure and does not require a gas bolus.
- Gag or retch - Gagging is a pharyngeal protective reflex with coordinated palatal and constrictor activity; hiccups lack that pharyngeal sequence and keep a fixed inspiratory-plus-glottic pattern.
- Sneeze - A sneeze is a nasal-triggered expulsive reflex; hiccups are diaphragmatic and do not require nasal afferent input or an expulsive phase.
- Diaphragmatic flutter (Leeuwenhoek disease) - Flutter is typically much faster (often well above 60/min) diaphragmatic contraction, frequently without the stereotyped glottic 'hic'; ordinary hiccups run 4-60/min with obligatory glottic closure. Some catalogues synonymise the two, so rate and glottic sound are the practical test.
- Laryngospasm - Laryngospasm is sustained glottic closure that blocks ventilation; in a hiccup the glottis closes only briefly after a short inspiratory jerk and then reopens.
- Vocal or motor tic - Tics are suppressible, often premonitory, and vary in form; hiccups are involuntary, stereotyped inspiratory-glottic events that cannot be postponed in the same way and continue in sleep when organic.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of hiccups this model covers, and on what evidence? provenance
Sources
- Singultus - Specialist definition, duration classes, reflex-arc anatomy, frequency 4-60/min, epidemiology, evaluation, treatment including FDA status of chlorpromazine, complications, and the absence of a dedicated guideline.
- Hiccups - Merck Manual Professional Edition - Clinical definition as diaphragmatic spasm plus glottic closure; persistent (>2 days) versus intractable (>1 month); gastric distention and alcohol as common transient triggers.
- Hiccups, Causes & Treatment - Practice classification into transient, persistent, intractable and recurrent hiccups; synonyms hiccough and singultus; advice to seek care after two days.
- 2026 ICD-10-CM Diagnosis Code R06.6: Hiccough - ICD-10-CM code R06.6 for hiccough/hiccup/singultus as a coded respiratory symptom.
- Chronic hiccup (Concept Id: C0744898) - SNOMED CT 716771000, Orphanet ORPHA396, MONDO:0018334, and the >48-hour definition of chronic hiccup as a rare movement disorder.
- hiccup (Q58952) - Crosswalk of Wikidata Q58952 to ICD-10 R06.6, ICD-11 MD11.6, MeSH D006606, UMLS C0019521 and related identifiers.
What the second pass must settle
- Which authoritative guidance should define duration categories and assessment thresholds, and how do these vary by age or clinical context?
- What minimum evidence supports reliable recognition when hiccups are silent, only self-reported or difficult to distinguish from other involuntary movements?
- What hiccup-free interval should separate episodes for this registry's intended uses, and should that rule vary between clinical assessment and personal tracking?
- Which measures of hiccup burden and frequency are sufficiently validated and practical for repeated agent-assisted recording?
- Which proposed interventions have adequate evidence, contraindication information and population-specific guidance to support agent recommendations?