What is the appropriate workup and management for a patient with chronic abdominal pain and normal CT scan, esophagogastroduodenoscopy (EGD), and colonoscopy?

Management of Chronic Abdominal Pain with Negative Workup

After negative CT, EGD, and colonoscopy, you should diagnose this as a disorder of gut-brain interaction (DGBI) and immediately establish a collaborative, empathic patient-provider relationship while initiating both neuromodulator therapy and brain-gut psychotherapy—avoiding further repetitive testing and never prescribing opioids. 1

Initial Framework and Diagnosis

Once structural disease is excluded with negative imaging and endoscopy, the diagnosis is a functional disorder or DGBI in the vast majority of cases 1, 2. The 2021 AGA guidelines are explicit: repetitive testing after negative workup is not recommended 2. Your primary task shifts from diagnosis to management.

Critical First Steps

Establish the therapeutic relationship immediately:

• Tell the patient explicitly: (1) their pain is real, (2) pain signals are processed and modulated in the brain, (3) peripheral gut factors can drive pain, and (4) most importantly—the pain is modifiable 1
• Explain that factors initiating pain (infection, surgery, stress) differ from factors perpetuating it 1
• Use the Fear-Avoidance model: the brain continues scanning for threats from the gut based on prior experience, mistakenly engaging unhelpful higher-order processes 1

Specific Workup Considerations Before Finalizing DGBI Diagnosis

Limited Additional Testing (Only If Specific Features Present)

Consider capsule endoscopy only if:

• Patient does NOT meet Rome III criteria for IBS AND
• Elevated CRP is present 3
• Detection rate in non-IBS patients with elevated CRP: 19% vs 3% in IBS patients 3

Red flags requiring specialist referral or targeted investigation:

• Anemia, blood in stool, nocturnal GI symptoms, weight loss 4
• Age considerations: digestive neoplasia can occur before age 50 5
• Severe or refractory symptoms warrant diagnosis review 6

Do NOT order:

• Repeat CT scans for undifferentiated abdominal pain 4
• Serial endoscopies without new alarm features 2

Treatment Algorithm

Phase 1: Immediate Dual Therapy (Start Early)

Pharmacologic: Gut-Brain Neuromodulators

Start tricyclic antidepressants (TCAs) as first-line 1:

• Master 2-3 specific neuromodulators with their dosing and side effects 1
• TCAs, SNRIs (serotonin-norepinephrine reuptake inhibitors), or mirtazapine are recommended 1
• These modulate pain from visceral stimuli and centrally-mediated factors 1

Non-Pharmacologic: Brain-Gut Psychotherapy (Introduce Early)

Do NOT wait 12 months—introduce immediately as part of comprehensive care 1:

• Cognitive behavioral therapy
• Gut-directed hypnotherapy
• Mindfulness-based stress reduction
• Acceptance and commitment therapy 1

The British Society guidelines suggest waiting 12 months after drug failure 6, but the 2021 AGA update—being more recent and specific to chronic GI pain in DGBI—recommends introducing psychotherapy "as early as possible" 1.

Phase 2: Optimize and Differentiate

Determine pain mechanism:

• Visceral-triggered pain (postprandial, related to bowel movements): optimize gut-directed therapies
• Centrally-mediated pain (constant, unrelated to eating/defecation): emphasize neuromodulators and psychotherapy 1

For severe/refractory cases:

• Consider combination neuromodulators (augmentation strategy) with vigilance for serotonin syndrome 6
• Multidisciplinary chronic pain team referral if pain becomes centrally-mediated 6

Critical Pitfalls to Avoid

Absolute Contraindications

Never prescribe opioids for DGBI-related chronic abdominal pain 1, 6:

• If patient is already on opioids from another provider, prescribe responsibly via multidisciplinary collaboration until discontinued 1
• Screen for narcotic bowel syndrome in patients on long-term opioids 6

Common Errors

• Psychological inflexibility: Patients overfocusing on finding a cause or single solution interferes with pain acceptance and treatment response 1
• Pain solicitation: Family members routinely asking about pain perpetuates the problem 1
• Iatrogenic harm: Avoid unnecessary surgery, repeated investigations, or unproven diagnostic approaches 6

Context-Specific Considerations

Assess for perpetuating psychological factors:

• Depression, anxiety, post-traumatic stress 1
• Prior negative healthcare experiences creating dissatisfaction 1
• Cultural differences in pain interpretation and preferred management 1

Distinguish from other conditions:

• Centrally mediated abdominal pain syndrome (CAPS) if pain is unrelated/out of proportion to sensory input 1
• Small intestinal dysmotility 6
• Narcotic bowel syndrome if opioid use present 6

Setting Shared Goals

Work collaboratively to:

• Understand impact on quality of life 1
• Set realistic expectations: goal is improved function, not complete pain elimination
• Integrate medical care with psychosocial information 1
• Avoid the trap of seeking a structural explanation once excluded 2