Diagnostic Approach to Vague Abdominal Pain

Life-Threatening Causes

Mesenteric ischemia presents with pain out of proportion to physical examination findings, particularly in elderly patients with cardiovascular disease, and carries 30-90% mortality 1, 2
Aortic dissection causes severe abdominal pain with abrupt onset when involving the abdominal aorta, with higher mortality in women due to atypical presentation 3, 2
Ruptured abdominal aortic aneurysm presents with severe abdominal and back pain, often with hypotension, and has >50% mortality even with prompt intervention 3, 2
Perforated viscus manifests with abdominal rigidity and peritoneal signs requiring immediate surgical evaluation 1

Acute appendicitis accounts for approximately one-third of emergency department presentations with acute abdominal pain and is most common in patients aged 10-30 years 4, 1
Acute cholecystitis represents 9-11% of acute abdominal pain cases 1
Small bowel obstruction occurs in 4-5% of cases 1
Acute pancreatitis presents with pain radiating to the back; severe cases require ICU monitoring and carry high mortality with infected necrosis 2

Crohn's disease and ulcerative colitis cause abdominal pain during disease flares, with 50-70% of IBD patients experiencing pain during active disease 3
Chronic pain in IBD can persist even when inflammation is quiescent, representing allodynia or hyperalgesia 5
Nocturnal symptoms in IBD may indicate active inflammation requiring therapy optimization 3

For nonlocalized acute abdominal pain with fever or concerning features, CT abdomen and pelvis with IV contrast is the preferred initial imaging 3, 1
CT angiography is the gold standard for diagnosing mesenteric ischemia and aortic pathologies 3, 2
Ultrasonography is preferred for right upper quadrant pain suggesting biliary disease 3
Plain radiographs have limited value in mesenteric ischemia as findings appear late when infarction has occurred 2

Pain out of proportion to physical findings is the hallmark of mesenteric ischemia and should trigger immediate CT angiography 1, 2
Laboratory values may be normal despite serious infection, especially in elderly and immunocompromised patients 1
Beta human chorionic gonadotropin testing is mandatory before imaging in all women of reproductive age 1

Bowel obstruction accounts for roughly 4–6 % of all emergency‑department presentations for acute abdominal pain and is responsible for about 15 % of hospital admissions for this symptom, highlighting its disproportionate impact on inpatient resources【6】【7】.

In women of reproductive age, urinary‑tract infections and gynecologic pathology are major contributors to abdominal‑pain presentations, underscoring the need for targeted evaluation of these conditions in female patients【8】.