CONSTIPATION

✓ Medically ReviewedSYMPTOMID: MDBT0107🚨 TRIAGE: ROUTINEICD-10: K59.0

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Definition

CLINICAL DEFINITION

Constipation is difficult, infrequent or incomplete stool passage. Stools are often hard with straining (pushing effort). Frequency is often below three per week. It spans short upset and chronic functional disease (lasting gut disorder). Rome criteria (symptom rules) require weeks of pattern with strain or blockage sense.

IN PLAIN ENGLISH

Poo comes too seldom or too hard. You must push hard to pass poo. Tummy may feel full or sore. Drink, fibre and walks can help. See care for blood or weight loss.

COMMON MISCONCEPTION / WHAT IT DOES NOT MEAN

Constipation is not diarrhoea (loose frequent stool). It is not isolated bloating alone without stool change. It is not bowel obstruction (blocked gut) alone, though blockage causes no passage. It is not rectal bleeding alone without passage change. Confirm with stool pattern, diet, drugs and rectal exam.

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Word Breakdown

con-

=together

stip-

=to press or crowd

-ation

=state or process

Literal Meaning: crowded together passage

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Abbreviations

IBS-C=Irritable bowel syndrome with constipation - cramp plus hard stools

OIC=Opioid-induced constipation - painkiller-related hard stools

CIC=Chronic idiopathic constipation - lasting constipation without clear cause

PR=Per rectal - finger exam of anus and rectum

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Synonyms & Variants

Hard stools›Infrequent bowel movements›Difficult stool passage›

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Category-Specific Context

Constipation is a Symptom because it is reported stool pattern change. It is not a Disease alone. It spans habit, drug and outlet causes (lifestyle, medicine and pelvic levels). Clinicians record frequency, hardness, strain and incomplete sense. Workup excludes blockage and systemic disease.

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Clinical Context & Usage

CLINICAL SETTINGS

Primary CareGastroenterology ClinicPaediatric ClinicGeriatric and Care Home ServiceEmergency Department for Impaction

USAGE & DOCUMENTATION NOTES

Record stool frequency, Bristol type (hardness scale), strain, incomplete sense and manual help. Ask about fibre, fluids, activity, opioids (painkillers), iron and thyroid signs. Do rectal exam (anus check) for impaction (packed stool) and masses. Do not label new change in older adults as simple without red-flag review.

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Primary Causes & Pathophysiology

PATHOPHYSIOLOGY

Slow colonic transit (lazy bowel movement) allows excess water reclaim and hardens stool. Dyssynergic defaecation (pelvic floor mismatch) blocks outlet despite urge. Opioids (painkillers) cut peristalsis (wave squeezes) and dry lumen (gut channel). Low fibre (roughage lack) lowers bulk and shortens stretch signals. Hard stool then injures lining and weakens urge.

PRIMARY CAUSES

Low fibre, low fluid and inactive lifestyle

Small dry bulk slows stretch signals and transit so water reclaim hardens stool

Irritable bowel syndrome with constipation

Gut-brain dysregulation (faulty control) slows transit with cramps and hard lumpy stools

Dyssynergic defaecation with pelvic floor mismatch

Paradoxical muscle squeeze blocks outlet so urge fails despite soft stool above

Slow-transit constipation

Weak colonic waves (poor squeezes) delay movement for days with infrequent urge

Neurological disease including Parkinson and multiple sclerosis

Nerve loss weakens peristalsis (wave squeezes) and rectal sense with overflow risk

Hypothyroidism and hypercalcaemia

Low thyroid or high calcium slows muscle contraction (squeeze strength) and transit throughout gut

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Drug-Induced Causes

💊 Opioids such as codeine, morphine and tramadol ↗

Mechanism: Cut peristalsis (wave squeezes) and raise sphincter tone (ring muscle tightness) drying stool

→ Review pain plan, add fluids with fibre, start osmotic laxative (softening drug) early, consider peripherally acting blocker via clinician

💊 Anticholinergics such as oxybutynin and amitriptyline ↗

Mechanism: Block gut squeeze signals causing dry mouth with slow dry stool

→ Review indication, reduce or switch agent with prescriber, monitor urine and confusion in elders

💊 Oral iron supplements ↗

Mechanism: Harden stool and darken colour while slowing transit in susceptible patients

→ Check dose and timing, add fluids with fibre, switch salt or dose only with clinician review

💊 Verapamil and other constipating calcium-channel blockers ↗

Mechanism: Lower smooth muscle squeeze (gut wall strength) slowing colonic transit

→ Monitor stool pattern, review pressure drug choice with clinician, add laxative bridge when needed

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Epidemiology

Prevalence:Constipation is common in primary care and care homes worldwide. It rises in children, pregnancy and older age. Drug-related cases are frequent with opioids (painkillers) and iron. Rates vary by definition and reporting.

Age Group:All ages are affected from infants to frail elders. Functional cases cluster in children and young women. Drug and outlet causes rise in older adults. New onset in older age needs red-flag review.

Geographic Distribution:Constipation occurs worldwide in all regions and diets. Patterns follow fibre, fluids, activity and toilet access. Detection tracks primary care review and drug use. No climate restriction applies.

Red Flags & Triage ★

TRIAGE LEVEL

🚨 ROUTINE

DO NOT MISS — LIFE-THREATENING PRESENTATIONS

Colorectal cancer with bleeding or weight loss
Bowel obstruction with no wind and vomiting
Faecal impaction with overflow masking as diarrhoea
Hypothyroidism with systemic slowing
Opioid-driven impaction with retention

URGENT EVALUATION TRIGGERS

No stool or wind with belly swelling and vomiting
Blood in stool with weight loss or anaemia (low red cells)
Severe belly pain with distension (swelling)
Overflow leakage with retention and confusion in elders
New change beyond 3 weeks in older adults

Complications

DOWNSTREAM CLINICAL COMPLICATIONS

Faecal impaction with packed rectum
Overflow incontinence with leakage
Anal fissure with painful crack
Haemorrhoids with bleeding
Rectal prolapse with straining
Urinary retention with pressure effect
Bowel obstruction with blockage in severe cases

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Confused With (LASA & DDx) ★

LEXICAL (LASA) — SIMILAR NAMES

Obstipation

Shares stool-stop wording but means complete failure to pass stool or wind, while constipation means hard infrequent passage

Diarrhoea

Opposite pattern with loose frequent stools confused when overflow leakage (false diarrhoea) masks impaction

Obstruction

Overlaps with no passage but obstruction means blocked gut with pain and vomiting needing emergency care

CLINICAL DIFFERENTIAL DIAGNOSES (DDx)

Functional constipation

Key Distinguishing Feature: Hard infrequent stools without alarm signs that ease with habit plus laxatives

Irritable bowel syndrome with constipation

Key Distinguishing Feature: Crampy belly pain linked to stool change with bloating rather than hard stools alone

Bowel obstruction

Key Distinguishing Feature: No stool or wind with colicky pain, distension (swollen belly) and vomiting needing emergency imaging

Faecal impaction

Key Distinguishing Feature: Packed rectum on finger exam with overflow leakage (false diarrhoea) rather than simple hard stools

Hypothyroidism-related slowing

Key Distinguishing Feature: Cold intolerance with fatigue, dry skin and low thyroid hormone plus global slowing

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Clinical Pearls

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Take Bristol type (hardness scale), fibre, fluids, activity and full drug list at diagnosis. Opioids (painkillers), iron and anticholinergics (drying drugs) often explain new cases.

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Examine rectum (anus check) for impaction (packed stool) before endless laxatives because packed stool needs washout not more bulk.

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Use stepwise laxatives with bulk then osmotic (water-holding drug) then stimulant per protocol. Reassess fluids, mobility and toileting routine at each step.

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Teach timed toileting after meals with footstool and privacy because gastrocolic reflex (meal-triggered urge) aids complete emptying.

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Refer new bleeding, weight loss, anaemia or persistent change in older adults on cancer pathway. Do not repeat laxatives without exam and labs.

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Example Usage & SOAP

CLINICAL SENTENCE

""72-year-old woman on codeine developed painful constipation needing drug and impaction review.""

IN A SOAP NOTE

S: 72-year-old woman with 6 days hard stools, strain, incomplete sense, on codeine, low fluids. O: Temp 36.7C, BP 138/82, HR 78, RR 16, SpO2 98 percent on air, belly soft with left fullness, rectal hard stool without blood. A: Constipation likely opioid-related with impaction. P: Fluids with fibre and walks, hold codeine review, osmotic laxative with enema plan, rectal recheck with red-flag net.

DIFFERENTIAL DIAGNOSIS CONTEXT

Hard infrequent stools without alarms favour functional constipation. Crampy pain linked to stool favours IBS constipation type. No wind with swelling and vomiting favours obstruction (blocked gut). Packed rectum with leakage favours impaction (packed stool). Check Bristol type, drugs and rectal exam together.

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Classifications & Scoring

GRADING SYSTEM

Rome IV functional constipation criteria

Symptom rules requiring strain, hard stools or blockage sense across weeks with frequency threshold

STAGING SCALE

Bristol Stool Form Scale

Seven-type stool hardness chart from hard lumps to liquid guiding habit and laxative choice

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Prognosis

SHORT-TERM OUTCOME

Short term outlook is good with fluids, fibre and prompt laxatives (softening drugs). Impaction (packed stool) often clears with enemas (rectal wash) and manual review. Delay with ignored blockage signs raises obstruction risk. Early rectal exam guides rescue.

LONG-TERM PROGNOSIS

Long term course follows habit, drugs and outlet function. Most functional cases improve with routine and review. Outlet mismatch may need biofeedback (muscle retraining). Persistent change with bleeding or weight loss needs cancer pathway.

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References & Coding

ICD-10 DIAGNOSTIC CODE

K59.0

LITERATURE CITATIONS & GUIDELINES

[1]WHO ICD-10 K59.0 Constipation

[2]NICE constipation management guidance

[3]Rome IV functional bowel disorder criteria

[4]Harrison's Principles of Internal Medicine bowel disorders

MEDICAL DISCLAIMER — This content is intended for educational purposes and qualified healthcare professionals only. Always refer to current clinical diagnostic criteria, institutional protocols, and official guidelines. Medobo is not responsible for clinical decisions made based on this content.