1. Start with risk, not the apparent severity of pain

An older adult with new abdominal pain may have serious disease despite mild tenderness or reassuring initial observations. Assess the individual: vascular disease, previous surgery, medications, baseline function and the trajectory of illness matter more than age alone.

On-shift check

• Have I considered ischemia, aneurysm/dissection, obstruction and perforation?
• Does my imaging protocol answer the dangerous diagnosis I am considering?
• Am I accepting incidental urine findings or symptom relief as the explanation?
• What changed on reassessment, and can this patient return safely if the illness evolves?

Historical cohorts show why caution is warranted: Lewis et al. (2005) admitted 58% of 360 patients aged 60 or older; Marco et al. (1998) reported surgery in 22.1% and condition-related death within two months in 5.3% of 375 patients with follow-up. Laurell et al. (2006) found less reliable initial diagnoses in older patients. These are cohort findings, not a bedside prediction rule.

2. Exclude time-critical vascular and surgical causes

• Mesenteric ischemia: consider it with severe unexplained pain, atrial fibrillation, atherosclerosis or a low-flow state. Ischemia can begin in the mucosa before peritoneal irritation develops; a soft abdomen is compatible with early disease. Diarrhea does not make it gastroenteritis. The classic pain–examination mismatch may be absent. WSES 2022.
• Symptomatic or ruptured AAA: new abdominal or back pain with syncope, hypotension or known aneurysm needs immediate assessment. Use bedside aortic ultrasound and contact vascular surgery promptly when an aneurysm is found, or the scan is unavailable/nondiagnostic and suspicion persists. Ultrasound detects an aneurysm; it does not reliably exclude rupture. NICE NG156.
• Aortic dissection: abrupt severe chest, back or abdominal pain with a pulse deficit, neurological finding or limb ischemia warrants an acute aortic pathway and urgent specialist assessment. Choose aortic-protocol CT angiography when feasible; bedside alternatives depend on stability and expertise. ACC/AHA 2022.
• Obstruction, strangulated hernia or perforation: persistent vomiting, distension, obstipation, a painful hernia or peritonism needs urgent surgical assessment. Examine hernia sites. Keep appendicitis, diverticulitis and complicated biliary disease in the differential even without textbook localization.

3. Normal observations and blood tests cannot close the case

In Potts and Vukov’s 1999 surgical cohort, 35 of 115 patients aged 80 or older with both measurements recorded had temperature below 37.5°C and white-cell count below 10,500/mm³. This selected population illustrates a diagnostic limitation; it does not estimate risk in every older patient.

Compare observations with baseline and repeat them. Assess perfusion, mental status, respiratory rate and evolving tenderness. Provide analgesia, then reassess; relief of pain is not proof of a benign cause.

A normal lactate does not exclude mesenteric ischemia. An elevated result indicates concern but is not specific to bowel injury. Do not wait for lactate to rise before indicated imaging. ESVS 2025 recommendations 31–33.

4. Match imaging to the diagnostic question

• Suspected mesenteric ischemia: request urgent CTA with arterial and venous phases and state the suspicion explicitly. Renal impairment should not delay this time-critical study; discuss contrast and resuscitation in parallel. A routine noncontrast abdominal CT is not an equivalent test. ESVS 2025.
• Unexplained or nonlocalized pain with ongoing concern: CT abdomen/pelvis with IV contrast is often appropriate. Select the protocol with radiology for the suspected pathology, renal function and any previous severe contrast reaction. Age alone is not an indication to scan everyone. ACR appropriateness criteria.
• Suspected biliary disease: ultrasound is usually the first study. A negative or equivocal examination does not end the workup when concern persists; CT, MRCP or cholescintigraphy may be appropriate depending on the question. ACR right-upper-quadrant pathway.
• Unstable patient: resuscitation, bedside assessment and surgical/vascular consultation run together. For suspected ruptured AAA, coordinate CTA or immediate transfer/repair with the vascular team; do not delay definitive care solely to obtain imaging.

5. Challenge the convenient diagnosis

• “It is a UTI”: pyuria or bacteriuria alone does not establish symptomatic infection or explain the pain. Look for compatible urinary and systemic features and continue assessing other causes. In suspected sepsis without a clear source, treat promptly while evaluating urinary and nonurinary sources. IDSA guidance.
• “It is indigestion”: upper abdominal discomfort may be an anginal equivalent. Obtain an ECG promptly and use an appropriate troponin pathway when ACS is plausible. AHA/ACC chest-pain guideline.
• “It is only an abdominal problem”: hypoxemia, pleuritic symptoms or abnormal chest findings should prompt assessment for pneumonia or pulmonary embolism. Check glucose and investigate metabolic causes when indicated. Vomiting with headache, focal neurological signs or altered consciousness needs a neurological assessment.

6. Build reassessment and disposition into the plan

Address hearing, language and cognitive barriers; obtain collateral history when needed without assuming the patient cannot report symptoms. Review anticoagulants, NSAIDs, steroids and drugs that affect bowel function. Establish baseline cognition, mobility and support. Frailty assessment and goals-of-care discussions should inform treatment, not replace assessment for reversible illness. BGS/CPOC perioperative frailty guidance.

Observe, admit or obtain further specialist assessment when pain remains unexplained or persistent, observations worsen, oral intake is inadequate, or safe reassessment at home is doubtful. Before discharge, repeat the examination, review results and document why immediate threats are unlikely. Give a specific follow-up plan and clear return advice for worsening pain, persistent vomiting, bleeding, fainting, breathlessness or new confusion.