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Key Definition: IBS is a functional gastrointestinal disorder characterised by recurrent abdominal pain and altered bowel habits in the absence of any structural or biochemical abnormality. It is diagnosed clinically using the Rome IV criteria.
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Rome IV Diagnostic Criteria
Recurrent abdominal pain
≥1 day/week on average in the last 3 months, associated with
≥2 of the following:
- Related to defecation
- Associated with change in stool frequency
- Associated with change in stool form/appearance
Criteria fulfilled for the last 3 months with symptom onset ≥6 months prior.
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Pathophysiology
- Visceral hypersensitivity — altered pain perception
- Gut-brain axis dysfunction — abnormal CNS-ENS signalling
- Altered gut motility — can be rapid or slow
- Altered microbiome — dysbiosis noted in some patients
- Post-infectious IBS — follows gastroenteritis (20-30%)
- Psychosocial factors — anxiety, depression co-morbid
IBS Subtypes (Bristol Stool Scale Based)
| Subtype | Predominant Feature | Stool Types (BSS) | First-line Treatment |
|---|
| IBS-C | Constipation predominant | BSS 1–2 (>25% of time) | Laxatives (avoid lactulose), soluble fibre |
| IBS-D | Diarrhoea predominant | BSS 6–7 (>25% of time) | Loperamide, low-FODMAP diet |
| IBS-M | Mixed bowel habits | Both BSS 1-2 AND 6-7 (>25%) | Low-FODMAP diet, antispasmodics |
| IBS-U | Unclassified | Does not meet above criteria | Symptom-based approach |
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Important Exam Point: IBS is a diagnosis of exclusion. Coeliac disease serology (anti-TTG IgA) MUST be checked in ALL patients presenting with IBS symptoms, as coeliac disease can mimic IBS perfectly.
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Red Flags — Must Exclude Organic Disease (IBD, Cancer, Coeliac): Rectal bleeding, unintentional weight loss, fever, nocturnal symptoms waking patient, age >45 years at first presentation, family history of CRC or IBD, iron-deficiency anaemia, raised CRP/ESR, change in bowel habit after age 60.
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History Taking
- Pain character, location, onset, duration
- Relationship of pain to defecation
- Stool frequency and consistency (Bristol Stool Scale)
- Bloating, flatulence, incomplete evacuation
- Food trigger diary
- Psychosocial history (anxiety, depression, life stress)
- Previous gastroenteritis episodes
- Medication history (opioids, antibiotics)
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Investigations
- FBC — exclude anaemia
- CRP/ESR — if elevated, suspect IBD/infection
- Anti-TTG IgA + total IgA — coeliac screen (mandatory)
- TSH — exclude thyroid disease
- Stool cultures — if diarrhoea-predominant
- Faecal calprotectin — if elevated (>50µg/g), consider IBD
- Colonoscopy — only if red flags present or age >45
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Differential Diagnoses
- Coeliac disease — mimic IBS-D
- Inflammatory bowel disease — Crohn's/UC
- Colorectal cancer — especially >45 years
- Microscopic colitis — watery diarrhoea
- Lactose/fructose intolerance
- Bile acid malabsorption
- Endometriosis — women with cyclical symptoms
- Ovarian pathology
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Faecal Calprotectin: A non-invasive stool test — if <50 µg/g, IBD is unlikely and IBS diagnosis can be supported. If >200 µg/g, colonoscopy is required. Very useful to avoid unnecessary colonoscopies in young patients.
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Low-FODMAP Diet — Most Evidence-Based Intervention
FODMAP = Fermentable Oligosaccharides, Disaccharides, Monosaccharides, And Polyols.
High-FODMAP foods to avoid:
- Wheat, rye, onion, garlic (Oligosaccharides)
- Milk, yoghurt, soft cheese (Disaccharides — lactose)
- Apples, honey, mango, watermelon (Monosaccharides — fructose)
- Stone fruits, mushrooms, sugar-free sweets (Polyols)
Duration: 4-8 weeks elimination, then systematic reintroduction. Requires dietitian supervision.
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Pharmacological Management
Abdominal pain / bloating:
- Antispasmodics — hyoscine butylbromide (Buscopan), mebeverine (Colofac) — first line for pain
- Peppermint oil capsules — smooth muscle relaxant, good evidence
IBS-D:
- Loperamide — reduces bowel frequency; NOT for pain
IBS-C:
- Soluble fibre (ispaghula/psyllium), osmotic laxatives
- Avoid lactulose — fermented by gut bacteria → worsens bloating
Refractory IBS:
- Low-dose TCAs (amitriptyline) — reduce visceral hypersensitivity
- SSRIs (fluoxetine) — especially if anxiety/depression co-morbid
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Lifestyle Modifications
- Regular, consistent meal times
- Reduce caffeine and alcohol (bowel stimulants)
- Reduce carbonated drinks
- Adequate fluid intake (1.5–2L/day)
- Regular physical activity (reduces transit time variability)
- Stress management — yoga, mindfulness
- Keep a food and symptom diary
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Psychological Therapies
- Cognitive Behavioural Therapy (CBT) — strong evidence for IBS
- Gut-directed hypnotherapy — shown to reduce IBS symptom severity
- Mindfulness-based stress reduction
Consider referral to gastroenterologist if:
- Symptoms refractory to 12 months of treatment
- Red flags develop at any point
- Significant impact on quality of life / employment
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Lactulose Warning: Lactulose is metabolised by colonic bacteria into gas (hydrogen and methane), which significantly worsens bloating in IBS-C patients. It should NOT be the first-choice laxative in IBS. Use ispaghula husk (Fybogel) or macrogol (Movicol) instead.
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Note: IBS itself does not lead to structural complications, cancer, or serious GI disease. However, it significantly impacts quality of life and can be associated with important co-morbidities and complications of mismanagement.
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Quality of Life Impact
- Work absenteeism — one of the leading causes of work absence
- Social isolation — fear of symptoms in public
- Anxiety and depression — co-morbid in up to 60% of IBS patients
- Sexual dysfunction — especially in women with IBS-C
- Sleep disturbance — nocturnal symptoms reported in some patients
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Complications of Mismanagement
- Nutritional deficiency — overly restrictive diets without dietitian supervision
- Opioid dependence — inappropriate opioid prescribing for IBS pain
- Antibiotic overuse — promoting resistant gut flora
- Delayed diagnosis of organic disease — missing IBD or cancer due to IBS label
- Medicalisation — excessive investigations causing anxiety
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When to Escalate / Refer
- Development of any red flag symptom
- Raised inflammatory markers (CRP >10, raised calprotectin)
- Anti-TTG IgA positive — refer to gastroenterology for duodenal biopsy
- Failed response to 12 months dietary + pharmacological management
- Significant psychological impact requiring specialist mental health input
- New rectal bleeding at ANY age
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GCC Nursing Context: IBS is common across the GCC region. Several unique cultural, dietary, and religious factors influence presentation, triggers, and nursing approach in Gulf healthcare settings.
🍽️ Dietary Triggers in GCC Culture ▼
High-FODMAP foods prevalent in GCC diet:
- Spiced and slow-cooked dishes (Machboos, Harees, Kapsa) — contain onion, garlic, dried fruits — all high-FODMAP
- Majlis culture — large social gatherings involve continuous eating over extended periods, which is a major IBS trigger
- Dates — polyols (sorbitol) can trigger IBS symptoms; culturally significant, especially during Ramadan
- Laban (buttermilk) and labneh — high lactose content
- Gahwa (Arabic coffee) with cardamom — caffeine stimulates gut motility
Nursing approach: Provide culturally sensitive dietary advice — acknowledge the social importance of food in GCC culture while identifying individual triggers. Avoid a "one size fits all" low-FODMAP approach. Refer to dietitian with GCC cultural competency.
🌙 Ramadan and IBS ▼
- Irregular meal timing during Ramadan disrupts gut motility rhythms, commonly unmasking IBS symptoms
- Iftar gatherings — large, rapid meals after fasting = significant IBS trigger (large meal volume + high-FODMAP foods)
- Suhoor meals (pre-dawn) — often irregular and nutritionally suboptimal
- Dehydration during daylight hours — worsens IBS-C symptoms
- Medication timing — advise patients on how to adapt antispasmodic dosing around Suhoor and Iftar
- Some patients report IBS improvement during Ramadan — reduced stress eating and more regular meal structure
Nursing advice: Counsel IBS patients before Ramadan. Recommend smaller portions at Iftar, gradual reintroduction of food after fasting, and adequate hydration between Iftar and Suhoor.
🤫 Cultural Stigma Around Bowel Symptoms ▼
- Discussion of bowel habits is considered taboo in many GCC cultures — patients may delay presentation for months or years
- Male patients may resist pelvic or abdominal examination by opposite-gender clinicians
- Symptoms may be attributed to "bad food" or spiritual causes rather than seeking medical help
- Female patients may only disclose symptoms to female nurses — ensure same-gender nurses where possible
Communication tips:
- Use neutral, non-embarrassing language
- Ensure privacy — single-sex clinical areas where available
- Involve family members with patient's permission to improve adherence
- Explain that IBS is a recognised medical condition — not a sign of weakness or poor hygiene
🏥 GCC Healthcare System Context ▼
- IBS management is primarily in outpatient/ambulatory care settings across DHA, DOH, MOH (KSA), MOPH (Qatar) facilities
- Dietitian referral is available in major GCC tertiary centres — low-FODMAP dietary counselling is offered at HMC (Qatar), SEHA (UAE), and MOH hospitals
- Psychological support services (CBT) are less accessible in some GCC countries — telehealth platforms increasingly filling this gap
- High prevalence of Type 2 Diabetes in the GCC means many IBS patients are also on metformin — metformin causes diarrhoea in up to 30% of patients and can mimic IBS-D
- Helicobacter pylori is more prevalent in GCC populations — consider testing if upper GI symptoms present alongside IBS-like features
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High-Yield Exam Points
- Rome IV: pain ≥1 day/week × 3 months + 2 of 3 criteria
- Always check anti-TTG IgA in all IBS patients
- Low-FODMAP = most evidence-based dietary intervention
- Avoid lactulose in IBS-C (worsens bloating)
- Loperamide = IBS-D (bowel frequency) but NOT pain
- Antispasmodics (mebeverine/hyoscine) = first-line for pain
- Low-dose TCA = refractory IBS (visceral hypersensitivity)
- Faecal calprotectin >200 = refer for colonoscopy
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Red Flags — Memorise These
- Rectal bleeding
- Unintentional weight loss
- Fever / systemic symptoms
- Age >45 years, first presentation
- Family history of CRC or IBD
- Iron-deficiency anaemia
- Raised CRP or ESR
- Nocturnal symptoms waking patient
Practice MCQs — IBS
Q1. A 34-year-old woman presents with 6 months of abdominal pain that improves after defecation, with alternating constipation and loose stools ≥2 days per week. She has no rectal bleeding. According to Rome IV criteria, what is the minimum frequency of abdominal pain required for IBS diagnosis?
A. At least 3 days per week
B. At least 3 days per month
C. At least 1 day per week on average over the last 3 months
D. Continuously for 6 months without remission
Correct: C. Rome IV requires recurrent abdominal pain averaging ≥1 day/week over the last 3 months, with symptom onset ≥6 months prior, plus ≥2 of the three associated features (related to defecation, change in frequency, change in form).
Q2. A nurse is reviewing management for a patient diagnosed with IBS-C. Which laxative should be specifically AVOIDED in this patient?
A. Macrogol (Movicol)
B. Lactulose
C. Ispaghula husk (Fybogel)
D. Senna
Correct: B. Lactulose is fermented by colonic bacteria, producing hydrogen and methane gas. This significantly worsens bloating and abdominal discomfort in IBS patients. Macrogol (osmotic) and ispaghula husk (soluble fibre) are preferred alternatives for IBS-C.
Q3. Which investigation is MANDATORY in ALL patients presenting with IBS symptoms, regardless of subtype, according to current guidelines?
A. Colonoscopy
B. Faecal calprotectin
C. Anti-tissue transglutaminase IgA (anti-TTG IgA) serology
D. CT abdomen and pelvis
Correct: C. Coeliac disease (anti-TTG IgA) serology is recommended in ALL patients with IBS-like symptoms to exclude coeliac disease, which can present identically to IBS-D. Total IgA must also be checked to exclude IgA deficiency (false negative anti-TTG in IgA-deficient patients).
Q4. A 29-year-old male with IBS-D reports worsening diarrhoea episodes during Ramadan. He fasts from dawn to dusk and eats a large Iftar meal. What is the MOST likely contributing factor to his IBS exacerbation?
A. Prolonged fasting causes mucosal inflammation
B. Reduced fluid intake permanently damages the colon
C. Disrupted meal timing and large Iftar meals with high-FODMAP foods triggering gut hypersensitivity
D. Fasting increases intestinal permeability causing permanent IBS worsening
Correct: C. The disruption of regular meal timing, combined with rapid consumption of large meals at Iftar (often containing high-FODMAP foods such as dates, garlic, onion, wheat-based breads), is the most common trigger for IBS exacerbation during Ramadan. Advise smaller, lower-FODMAP Iftar meals and adequate hydration between Iftar and Suhoor.