What evaluation and management should be recommended for a 39-year-old Filipino male with no known comorbidities who reports occasional migratory abdominal tenderness and has no visible lesions?

Evaluation and Management Recommendation

This patient requires baseline laboratory investigations (CBC, CRP/ESR, coeliac serology) and consideration of IBS as the primary diagnosis, given the migratory abdominal tenderness without alarm features, with imaging reserved only if red flags emerge or laboratory abnormalities are detected 1.

Initial Diagnostic Approach

The migratory nature of the abdominal tenderness without visible lesions or comorbidities in a 39-year-old male suggests a functional gastrointestinal disorder rather than acute surgical pathology. The key is distinguishing between IBS and organic disease through a structured evaluation.

Essential History Elements to Elicit

Focus your history on:

• Onset timing and duration - when symptoms first began
• Relationship between pain and bowel habits - does pain improve/worsen with defecation, or correlate temporally with diarrhea or constipation
• Stool pattern using Bristol stool chart on abnormal days
• Presence of bloating or visible distension (highly suggestive of IBS if present)
• Triggers: recent gastroenteritis, antibiotic use, or psychological stressors 1
• Red flags: weight loss, rectal bleeding, nocturnal symptoms, fever, family history of IBD or colorectal cancer

Required Baseline Investigations

Obtain immediately 1:

• Full blood count
• C-reactive protein or ESR
• Coeliac serology
• Faecal calprotectin is NOT indicated in this case (only recommended for diarrhea-predominant symptoms in patients <45 years) 1

Decision Algorithm Based on Laboratory Results

If Laboratory Tests Are Normal:

Make a positive diagnosis of IBS 1. The migratory tenderness pattern fits with the variable pain location characteristic of IBS (upper or lower abdomen). No imaging is needed if:

• No alarm features present
• Laboratory markers normal
• Patient recognizes relationship between pain and bowel changes

If Laboratory Tests Show Abnormalities:

Proceed with imaging based on pain location 2, 3:

• Generalized or migratory pain: CT with IV contrast
• Right upper quadrant predominance: Ultrasonography first
• Lower quadrant pain: CT with IV contrast

Critical caveat: If faecal calprotectin were obtained and ≥250 μg/g, proceed directly to colonoscopy due to high IBD suspicion 1. This is particularly relevant given emerging data showing increasing IBD incidence in Asian populations, including Filipinos 4.

Management Framework

Patient Education and Expectation Management

Essential discussion points 1:

• IBS is a real diagnosis, not psychological
• No cure exists; treatments improve quality of life
• Long-term management likely necessary
• Empathic listening builds trust and improves outcomes

Treatment Initiation

First-line approach depends on predominant symptoms:

For pain-predominant IBS 5:

• Low-dose tricyclic antidepressants (TCAs) as first choice
• Start low, titrate based on response
• TCAs provide visceral analgesia independent of mood effects

Dietary modifications 5:

• Standard dietary advice initially
• Low FODMAP diet if symptoms persist or are moderate-to-severe
• Requires dietitian guidance for proper implementation

If psychological symptoms coexist 5:

• SSRIs at therapeutic doses preferred over low-dose TCAs
• SNRIs alternative for chronic pain with psychological comorbidity
• Brain-gut behavioral therapy (CBT, hypnotherapy) for moderate-to-severe symptoms

Common Pitfalls to Avoid

1. Over-investigation: Resist pressure for extensive imaging without red flags or abnormal labs - this reinforces illness behavior and increases costs 1

2. Delayed analgesia: Provide appropriate pain relief during evaluation - evidence shows this doesn't impair diagnostic accuracy 6

3. Missing the diagnosis window: If initial labs are normal, re-evaluate at 12 hours before dismissing concerns 7

4. Ignoring the migratory pattern: While migratory pain can suggest functional disease, remain vigilant for rare presentations of serious conditions 8

5. Underestimating diagnostic delay impact: In Filipino populations with IBD, diagnostic delay associates with worse outcomes including higher relapse rates 4

Follow-Up Plan

Agree on explicit follow-up 1:

• Reassess symptom response to initial management in 4-6 weeks
• Serial examinations valuable if diagnosis uncertain 9
• Consider diagnostic laparoscopy only if imaging inconclusive and symptoms severe in younger patients 7

The absence of visible lesions and comorbidities, combined with migratory tenderness, strongly favors functional disease over structural pathology, making IBS the most likely diagnosis pending normal laboratory confirmation.