About This Page
This is a clinician-written, evidence-based guide aligned to the MCC Examination Objectives. It is structured by clinical presentation — the way the MCCQE tests and the way patients actually present. Management reflects current Canadian guidelines (CMA, CFPC, CPS). Always cross-reference with institutional protocols and clinical judgment.
The Bottom Line
- Use alarm features to separate organic from functional causes
- The differential diagnosis table is the centrepiece: prioritize emergency causes before common benign causes
- Initial investigations should be targeted to physiology, pregnancy status when relevant, organ pattern and Canadian practice pathways
- Management depends on severity: resuscitate unstable patients, treat reversible causes and involve specialists early when red flags are present
- For MCCQE1, focus on the next best step, CanMEDS communication/safety-netting and Canadian rather than US/UK guideline patterns
Approach to the Presentation
Abdominal Pain — Chronic / Recurrent is assessed as a clinical presentation rather than as a named diagnosis. The first task is to identify instability, red flags and immediately reversible threats. Then classify the syndrome by timing, associated symptoms, examination findings and dominant organ pattern. In Canadian MCCQE1-style questions, the safest pathway is usually to stabilize first, rule out must-not-miss causes, use targeted investigations rather than shotgun testing, and give clear follow-up and safety-net advice.
Differential Diagnosis
| diagnosis | likelihood | key features | distinguishing test |
|---|---|---|---|
| Colorectal, Gastric, Pancreatic or Ovarian Malignancy | must-not-miss | Weight loss, anaemia, bleeding, early satiety, progressive symptoms, new bowel habit change after age 50 | CBC/ferritin, colonoscopy, upper endoscopy, CT abdomen/pelvis, pelvic ultrasound where appropriate |
| Inflammatory Bowel Disease | must-not-miss | Chronic pain with diarrhoea, blood/mucus, nocturnal stooling, weight loss, fever, perianal disease | Fecal calprotectin, CRP, colonoscopy with ileoscopy and biopsies |
| Chronic Pancreatitis / Pancreatic Cancer | must-not-miss | Epigastric pain radiating to back, steatorrhoea, diabetes, weight loss, alcohol/tobacco history | CT pancreas protocol, MRCP/EUS, fecal elastase |
| Peptic Ulcer Disease / Dyspepsia | common | Epigastric burning/gnawing pain, meal relation, NSAID use, H. pylori risk | H. pylori test-and-treat if <60 without alarm; endoscopy if >=60 or alarm/high-risk |
| Irritable Bowel Syndrome | common | Recurrent pain related to defecation and stool frequency/form change, bloating, fluctuating course | Rome IV criteria; limited normal tests when indicated |
| Celiac Disease | common | Bloating, diarrhoea or constipation, iron deficiency, fatigue, infertility, osteoporosis | tTG-IgA + total IgA while eating gluten; duodenal biopsy if positive/high suspicion |
| Biliary Colic / Gallbladder Disease | common | Episodic RUQ/epigastric pain after meals, right shoulder radiation, nausea | RUQ ultrasound |
| Endometriosis / Chronic Pelvic Pain | common | Cyclic pelvic/lower abdominal pain, dysmenorrhoea, dyspareunia, infertility, bowel/bladder pain around menses | Clinical + pelvic ultrasound; laparoscopy if uncertain/refractory |
| Chronic Constipation / Faecal Loading | common | Infrequent stools, straining, incomplete evacuation, bloating, pain relieved by bowel movement | Clinical diagnosis; DRE; colonoscopy/imaging if alarm features |
| Abdominal Wall Pain / Nerve Entrapment | less common | Focal pain worse with movement/tensing, no bowel relation | Positive Carnett sign; response to local anaesthetic injection |
Red Flags & Key History
Symptoms
Unintentional weight loss, anorexia, early satiety or progressive symptoms
GI bleeding, melena, haematochezia or iron deficiency anaemia
Nocturnal diarrhoea or pain waking from sleep
Persistent vomiting or progressive dysphagia
Family history of colorectal cancer, IBD, celiac disease or ovarian cancer
Pain related to defecation and stool form/frequency change — IBS pattern if no red flags
Cyclic pelvic pain or dyspareunia — endometriosis pattern
Signs
Cachexia, lymphadenopathy, abdominal mass, ascites or hepatosplenomegaly
Perianal fistula, tags or abscess — Crohn disease
Pallor, glossitis or koilonychia — iron deficiency/malabsorption/bleeding
Pelvic mass or nodularity
Positive Carnett sign — abdominal wall source more likely
Approach to Investigation
First-line
CBC + ferritinAnaemia or iron deficiency is an alarm feature.
CRP +/- fecal calprotectinHelps identify inflammatory bowel disease.
Liver enzymes, bilirubin, lipase, electrolytes/creatinineScreens hepatobiliary, pancreatic, renal and metabolic contributors.
Celiac serologytTG-IgA + total IgA, especially with diarrhoea, bloating, iron deficiency or weight loss.
Urinalysis + beta-hCG when relevantExclude urinary and pregnancy-related mimics.
Second-line
Abdominal ultrasoundBiliary disease, liver disease, ascites and selected pelvic/renal concerns.
CT abdomen/pelvisAlarm features, mass, suspected malignancy, chronic pancreatitis or complicated disease.
Upper endoscopyDyspepsia age >=60, alarm features, dysphagia or refractory symptoms.
Colonoscopy with biopsiesBleeding, iron deficiency, chronic inflammatory diarrhoea, suspected IBD/microscopic colitis/cancer.
Specialist
MRCP / EUSSuspected pancreaticobiliary disease not clarified by ultrasound/CT.
LaparoscopySuspected endometriosis or diagnostic uncertainty after appropriate non-invasive workup.
Management Principles
CAG IBS and Dyspepsia Guidelines + Canadian primary care pathways1
Alarm-feature pathway
- Do not label as IBS/functional pain when red flags are present
- Arrange appropriate endoscopy/imaging and expedited referral
- Correct anaemia, dehydration, malnutrition and electrolyte disturbance
2
Likely IBS / functional abdominal pain
- Explain the positive diagnosis and gut-brain mechanism
- Dietary intervention: soluble fibre or low-FODMAP with support
- Symptom-targeted therapy: PEG, loperamide, antispasmodics or peppermint oil
- Consider psychological therapies or low-dose neuromodulator in persistent pain-predominant symptoms
3
Dyspepsia-type pain
- If <60 without alarm features: H. pylori test-and-treat then PPI trial
- If >=60 or alarm/high-risk features: upper endoscopy
4
Disease-specific management
- IBD: gastroenterology and colonoscopy confirmation
- Celiac disease: gluten-free diet after diagnostic confirmation
- Biliary disease: surgical referral for symptomatic stones
- Endometriosis: gynaecology referral if severe/refractory
Complications & Pitfalls
- Calling it IBS too early: red flags override a functional pattern.
- Using FIT to rule out cancer: symptomatic red flags may require colonoscopy/imaging.
- Missing celiac disease: it can present with constipation or iron deficiency.
- Ignoring pelvic causes: endometriosis and ovarian pathology can mimic bowel pain.
MCCQE1 Exam Tips
- 1Use alarm features to separate organic from functional causes
- 2IBS: recurrent abdominal pain related to defecation and stool change, with no red flags
- 3CAG/ACG dyspepsia: endoscopy at age >=60 or alarm/high-risk features
- 4Chronic diarrhoea + blood/nocturnal symptoms/weight loss is not IBS
- 5Iron deficiency anaemia in an adult with abdominal symptoms requires GI evaluation
- 6Carnett sign supports abdominal wall pain
practicetest your knowledge on abdominal pain — chronic / recurrentApply what you've learnt with MCCQE1-style questions from the iatroX Q-Bank — gastrointestinal and beyond.
open q-bank