flatulence
Enable an AI agent to recognise reported or observed passage of intestinal gas through the anus, assess its pattern and impact, and identify appropriate recording, support or further assessment.
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 reported or observed passage of intestinal gas through the anus, assess its pattern and impact, and identify appropriate recording, support or further assessment.
Anal expulsion of flatus: a variable mixture of swallowed nitrogen (with residual oxygen) that has reached the colon, plus hydrogen, carbon dioxide, methane and trace sulfur gases generated by colonic microbiota fermenting unabsorbed carbohydrate and protein.
It can be Record a gas-passage event while preserving evidence, privacy preferences and uncertainty.; Summarise frequency and clustering over a clearly defined observation period.; Compare the current pattern, control and burden with the person's own baseline.; Explore time-linked contexts without asserting that they caused the flatulence.; Track the outcome of a person-chosen or clinician-directed management change.; Prepare a symptom summary for further assessment using an external, validated clinical decision policy..
Distinguishing features
The reported route is through the anus; gas released through the mouth belongs to belching.
An event concerns passage of gas; abdominal fullness or visible enlargement alone does not establish flatulence.
Sound or odour alone is insufficient when its source cannot be established, and their absence does not exclude a reported event.
Passage of stool or mucus is recorded separately, even when it occurs alongside gas.
Unwanted gas passage is distinguished from deliberate passage by the person's awareness, intention and ability to defer it.
Scope
+ Individual gas-passage events and recurring patterns
+ Reported or observed evidence, including uncertainty about occurrence
+ Frequency, timing, perceived sound and odour
+ Awareness, ability to defer passage and unwanted episodes
+ Associated sensations, activity disruption and social impact
+ Temporal associations with intake, bowel activity and changes in routine
- Belching and other gas release through the mouth
- Bloating or abdominal distension without established anal gas passage
- Underlying digestive diseases and their diagnostic models
- Faecal incontinence and stool characteristics beyond their association with a gas event
- Food, medication and supplement models, including prescribing decisions
- Ambient odour or air-quality events without evidence of bodily gas passage
Characteristics
- Occurrence evidence
- person-reported | directly observed | instrument-recorded | uncertain; multiple values permitted Separates an established report or observation from inference based only on sound, odour or abdominal sensation.
- Event frequency
- events per stated observation interval, with counting method and coverage Supports comparison while exposing incomplete observation and inconsistent counting.
- Pattern relative to personal baseline
- unchanged | increased | decreased | newly noticed | unknown Captures meaningful change without assuming a universal normal frequency.
- Timing and clustering
- event timestamps, cluster duration in minutes, or approximate time windows Distinguishes isolated passage from repeated episodes and supports contextual comparison.
- Perceived sensory qualities
- sound and odour each recorded as unnoticed | noticed | bothersome | unknown, with observer attribution Records the experience without treating subjective qualities as measured gas composition or volume.
- Control over passage
- deliberate | successfully deferred | unwanted despite awareness | occurred without prior awareness | unclear Distinguishes frequency concerns from concerns about awareness or control.
- Associated sensations
- linked reports of pressure, bloating, pain or relief, each with timing and person attribution Connects gas passage with the person's experience without merging distinct symptoms.
- Functional and social impact
- none reported | discomfort | embarrassment | interrupted activity | avoidance; multiple values permitted Makes burden assessable independently of the number of events.
- Contextual association
- time-linked meals, drinks, medicines, supplements, bowel movements, posture or activity; causal status unestablished unless separately supported Supports investigation without turning coincidence into a cause.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.flatulence
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 16 findings · 24 questions.
Gas passage recognition Establishes whether the record concerns anal gas passage and how that conclusion was reached.
Flatulence can be confused with abdominal sensations, belching or an unexplained sound or smell.
Route and material
Identifies the reported exit route and distinguishes gas from accompanying material.
Anal gas event
A candidate event must be characterised by reported or observed anal gas passage rather than by a nonspecific sensation.
- Was gas reported or observed passing through the anus, or was only pressure, sound or odour noticed? definition
- Was stool, mucus or another material also passed and therefore in need of a separate linked record? boundary
Evidence and event boundaries
Preserves who identified the passage and how individual releases were counted.
Attributed event record
The record distinguishes direct experience, external observation and uncertain inference, and makes its event-counting convention explicit.
- Who reported or observed the passage, and what evidence supports identifying it as flatulence? provenance
- Were closely spaced releases counted separately or as one episode, and could any records describe the same event? measurement
Passage pattern and qualities Describes how often gas passes, when it occurs and which qualities are actually known.
A useful flatulence record must separate measured patterns from impressions of amount, loudness or smell.
Frequency and baseline
Quantifies passage within an observation window and compares it with prior experience.
Observed frequency change
Counts or estimates are interpretable only alongside observation coverage and a stated comparison period.
- How many events or episodes occurred during what interval, and which parts of that interval were unobserved? measurement
- How does this compare with the person's usual pattern, and when was the change first noticed? measurement
Sound, odour and amount
Records perceived qualities while keeping them distinct from physical measurements.
Sensory report limits
Sound, odour and perceived amount retain their observer and measurement status rather than serving as proxies for gas composition or volume.
- Which qualities were noticed, by whom, and were they merely detectable or bothersome? measurement
- Is any stated gas amount directly measured, a subjective estimate or unknown? provenance
Awareness, control and burden Captures whether passage was anticipated or wanted and what effects it had.
Similar passage frequencies can have different significance depending on control, discomfort and disruption.
Awareness and deferral
Separates intention, advance awareness and the ability to postpone passage.
Wanted and unwanted passage
An episode can be deliberate, unwanted despite awareness or noticed only after it occurred.
- Was the person aware that gas was about to pass, and did they intend to release it? measurement
- If the person tried to postpone passage, were they able to do so? measurement
Sensations and disruption
Connects passage to reported sensations and consequences in daily life.
Experienced burden
Physical sensations and social effects are recorded as experienced, including whether passage changes discomfort.
- What pressure, bloating or pain was reported before and after passage, and did it improve, worsen or remain unchanged? measurement
- Did the episode interrupt an activity, cause embarrassment or lead the person to avoid a situation? measurement
Context and response Links the passage pattern to relevant circumstances and supports review of possible next steps.
Acting on flatulence requires contextual evidence, explicit uncertainty and outcomes that reflect the person's concern.
Temporal associations
Records candidate associations with intake, bowel activity and routine without assigning unsupported causes.
Candidate pattern associations
A proposed trigger remains a hypothesis unless the available evidence supports a stronger conclusion.
- What meals, drinks, medicines, supplements, bowel movements or activities preceded the episodes, and by how long? measurement
- Does the association recur across comparable observations, and what other changes could explain it? provenance
Management and assessment
Tracks authorised responses and identifies when decisions need a neighbouring clinical model.
Response outcome and handoff
A response is linked to its intended benefit and observed outcome; diagnosis and clinical escalation criteria remain externally governed.
- What person-chosen or clinician-directed change was tried, when, and what happened to frequency, control or burden? action
- Do accompanying symptoms or changes meet an applicable validated policy for further assessment, and which policy supports that decision? 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.
- Physiologic dietary-fermentation flatus from residual fibre, oligosaccharides and resistant starch
- Nitrogen-rich swallowed-air flatus from aerophagia
- Hydrogen-producer microbial phenotype
- Methane-producer phenotype (methanogen-dominant colonic gas)
- Sulfurous malodorous flatus (hydrogen sulfide, methanethiol, dimethyl sulfide)
- Carbohydrate-malabsorption flatus (lactose, fructose, polyols and other FODMAPs)
- Drug- or prebiotic-induced flatus (lactulose, acarbose, inulin and similar substrates)
- Disease-associated excess (small-intestinal bacterial overgrowth, exocrine pancreatic insufficiency, celiac disease, IBS)
- Which of these kinds and varieties hold for the sense of flatulence 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 - Q160289 - Item for flatulence as a physiological phenomenon and symptom.
- ICD-10-CM - R14.3 - Flatulence; parent R14 covers gaseous digestive symptoms including distension (R14.0), gas pain (R14.1) and eructation (R14.2).
- ICD-10 - R14 - WHO ICD-10 block 'Flatulence and related conditions' (not split to R14.3 in all national modifications).
- MeSH - D005414 - MeSH heading Flatulence.
- UMLS CUI - C0016204 - UMLS concept for flatulence.
- Which of these identifiers and schemes hold for the sense of flatulence 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.
- ICD-10-CM R14.0-R14.3 (CDC / NCHS) - coding of gaseous digestive symptoms, with R14.3 specifically for flatulence.
- SNOMED CT (SNOMED International) - clinical findings for flatulence and excessive flatus used in EHRs.
- North American Consensus on Hydrogen and Methane-Based Breath Testing, 2017 (published in the American Journal of Gastroenterology) - protocol for measuring fermentative hydrogen and methane that constitute most flatus.
- Rome IV (Rome Foundation) - functional bloating and abdominal distension as related but separate constructs; flatulence is not a standalone Rome disorder.
- Endoscopy electrosurgery safety practice (ASGE and related GI society guidance) - combustible colonic hydrogen/methane must be evacuated before spark-gap or diathermy use.
- Which of these standards and regulation hold for the sense of flatulence 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.
- Presenting complaint and quality-of-life issue in primary care and gastroenterology, often with IBS or food-intolerance workups.
- Outcome measure in low-FODMAP, lactase and alpha-galactosidase (e.g. bean-enzyme) dietary trials.
- Indirectly assessed by hydrogen/methane breath tests for carbohydrate malabsorption and small-intestinal bacterial overgrowth.
- Managed on ostomies with charcoal or odor-filter flatus pouches.
- Social, occupational and etiquette problem; also a staple of comedy and folk medicine.
- Which of these real-world use hold for the sense of flatulence 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.
- 24-hour flatus volume (healthy adults) - 500-1500 (reported extremes about 200-2000) - mL
- Passage frequency - 8-20 - expulsions per day
- Nitrogen fraction of flatus - 20-90 - volume percent
- Hydrogen fraction of flatus - 0-50 - volume percent
- Methane fraction of flatus (producers; often undetectable in non-producers) - 0-10 - volume percent
- Hydrogen sulfide in odorous flatus - parts-per-million (odor-determining; air odor threshold ~0.5 ppb) - ppm
- Which of these typical measurements hold for the sense of flatulence 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.
- Social distress, avoidance and reduced quality of life even when volumes are physiologically normal.
- Marker of underlying maldigestion, enzyme deficiency, SIBO or motility disorder when sudden, extreme or accompanied by weight loss or steatorrhea.
- Intraluminal explosion during colonoscopic or surgical electrosurgery if hydrogen or methane remains in the combustible range in an unprepared bowel.
- Flatus incontinence after anal-sphincter injury, childbirth or neuropathy, distinct from voluntary passage.
- Misattribution of obstruction, ischemia or bloating as 'just gas'.
- Which of these failure modes and hazards hold for the sense of flatulence 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.
- Clinical and colloquial naming: US 'gas' versus UK, Irish and Australian 'wind'; many languages separate a clinical term from a taboo colloquialism.
- Lactase non-persistence (hence lactose-related flatus) is the majority adult phenotype in East Asia, much of Africa and many Indigenous American populations, and a minority in northern Europe.
- High-legume staple diets (e.g. parts of Mexico, India and Africa) raise expected fermentation volume relative to Western low-FODMAP clinic populations.
- Strength of public taboo and willingness to report the symptom in clinic vary widely by culture.
- Which of these regional variation hold for the sense of flatulence 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.
- Eructation (belching) - Gas leaves via the mouth from stomach or esophagus; not anal and not primarily colonic fermentation.
- Bloating - A sensation of trapped gas that need not be accompanied by expulsion; a Rome symptom, not a passage event.
- Abdominal distension - Objective increase in girth (ICD-10-CM R14.0); can occur with or without flatus.
- Vaginal air expulsion - Extra-intestinal; typically odorless and unrelated to colonic microbiota.
- Fecal incontinence - Passage of stool rather than gas; soiling distinguishes it from isolated flatus.
- Pneumaturia - Gas in urine, indicating fistula or urinary fermentation, not anal expulsion.
- Borborygmus - Audible movement of gas or fluid in bowel lumen without expulsion through the anus.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of flatulence this model covers, and on what evidence? provenance
Sources
- Gas in the Digestive Tract. National Institute of Diabetes and Digestive and Kidney Diseases (NIH). - Clinical framing of intestinal gas as swallowed air plus colonic fermentation; everyday frequency and dietary triggers.
- Investigation of normal flatus production in healthy volunteers. Gut (BMJ Publishing Group), 1991. - Measured 24-hour volume and passage counts in healthy adults; basis for typical volume and frequency ranges.
- Identification of gases responsible for the odour of human flatus and evaluation of a device purported to reduce this odour. Gut (BMJ Publishing Group), 1998. - Sulfur gases as the odorants of flatus; distinction of malodorous from largely odorless nitrogen/hydrogen/methane mixtures.
- Hydrogen and Methane-Based Breath Testing in Gastrointestinal Disorders: The North American Consensus. American Journal of Gastroenterology, 2017. - Standardized clinical measurement of the fermentative gases that make up most flatus; hydrogen versus methane producer phenotypes.
- ICD-10-CM R14.3 Flatulence. CDC National Center for Health Statistics. - Official clinical classification of flatulence as a symptom code, distinct from eructation and gaseous distension.
- flatulence (Q160289). Wikidata. - Canonical public identifier and crosswalks to MeSH and other catalogues.
What the second pass must settle
- Should the registry entry own both individual gas-passage events and the recurring symptom pattern, or link these to separate event and state models?
- What observation methods and counting conventions provide sufficiently reliable frequency estimates without imposing excessive recording burden?
- Which validated measures, if any, should represent flatulence-related bother, odour perception and ability to defer passage?
- Where should ownership of recurrent involuntary gas passage sit relative to continence and pelvic-floor models?
- Which population-specific clinical policies should govern assessment handoffs, and what minimum accompanying information do they require?