IBS in Singapore
Irritable Bowel Syndrome (IBS) is Singapore's most common functional gastrointestinal disorder, affecting an estimated 8–12% of the population. It causes recurrent abdominal discomfort and altered bowel habits without any structural abnormality on investigation. Despite being 'functional', IBS significantly impacts quality of life — many patients restrict their diet, social activities, and work due to symptoms.
IBS Subtypes
| Subtype | Characteristics | Treatment Approach |
|---|---|---|
| IBS-D (Diarrhoea-predominant) | Loose, watery stools >25% of time; urgency; more common in men | Loperamide, antispasmodics, bile acid sequestrants, rifaximin |
| IBS-C (Constipation-predominant) | Hard/lumpy stools >25% of time; straining; bloating; more common in women | Soluble fibre, laxatives (lactulose, PEG), linaclotide, lubiprostone |
| IBS-M (Mixed) | Both loose and hard stools alternating | Combination approach depending on dominant symptom |
| IBS-U (Unclassified) | Does not fit C/D/M criteria | Symptom-specific treatment |
The Low-FODMAP Diet for IBS
The low-FODMAP diet (developed by Monash University) is the most evidence-based dietary intervention for IBS, providing symptom relief in 50–80% of patients. FODMAPs are fermentable carbohydrates that are poorly absorbed and fermented by gut bacteria, producing gas and triggering IBS symptoms.
High-FODMAP foods to reduce: onions, garlic, wheat, rye, lactose-containing dairy, apples, pears, watermelon, stone fruits, legumes, and excessive coffee. Work with a dietitian for proper implementation — the diet is highly effective but complex to follow correctly.
Treatment Approach
Dietary
- Low-FODMAP diet (elimination phase 4–6 weeks, then systematic reintroduction)
- Regular meal times; avoid skipping meals
- Adequate soluble fibre (psyllium, oat bran) for IBS-C; reduce insoluble fibre if it worsens symptoms
- Reduce caffeine, alcohol, spicy food, and carbonated beverages
Medications
- Antispasmodics (mebeverine, hyoscine butylbromide — Buscopan): for abdominal cramping/pain
- Loperamide (Imodium): for IBS-D — reduces stool frequency and urgency
- Osmotic laxatives (lactulose, PEG/Movicol): for IBS-C
- Low-dose TCAs (amitriptyline) or SSRIs: gut sensitisation, central pain modulation — prescribed by gastroenterologist for refractory cases
- Rifaximin: non-absorbable antibiotic for IBS-D with bloating/SIBO component
- Linaclotide/Lubiprostone: newer agents for refractory IBS-C
See our researched shortlist: subspecialty focus, credentials and clinic websites, checked against public records.
View the shortlist →IBS symptoms include abdominal pain or cramping (usually relieved by defecation), bloating and distension, altered bowel habits (diarrhoea-predominant, constipation-predominant, or mixed), urgency, incomplete evacuation, and mucus in stool. Symptoms are often triggered by stress, certain foods, hormonal changes, or illness. IBS does not cause bleeding, weight loss, or anaemia — these symptoms require urgent investigation to exclude organic disease.
IBS is diagnosed using the Rome IV criteria — recurrent abdominal pain at least 1 day/week for the past 3 months, associated with at least 2 of: related to defecation, change in stool frequency, or change in stool consistency. Blood tests, stool tests, and colonoscopy are performed to exclude other causes (IBD, colorectal cancer, coeliac disease, thyroid disease). IBS is a diagnosis of exclusion.
Common IBS triggers include: high-FODMAP foods (fermentable carbohydrates — onions, garlic, wheat, dairy, legumes), stress and anxiety, caffeine, alcohol, fatty meals, hormonal changes (worse around menstruation), and gut infections (post-infectious IBS). Singapore's high-stress work culture and spicy, rich food culture are particularly relevant triggers.
IBS is a functional disorder — the gut structure is normal but gut-brain signalling is dysregulated. There is no permanent cure, but many patients achieve excellent symptom control through dietary modification (low-FODMAP diet), stress management, medications (antispasmodics, loperamide, laxatives, low-dose antidepressants for gut sensitisation), and gut-directed psychotherapy. Many patients' symptoms improve significantly over time.
See a gastroenterologist if you have: rectal bleeding, unexplained weight loss, nocturnal symptoms waking you from sleep, symptom onset after age 50, family history of colorectal cancer or IBD, anaemia, or symptoms not responding to initial GP management. These 'red flag' features require investigation to exclude serious pathology before a functional diagnosis is made.