In a 30‑year‑old woman with left upper abdominal pain that begins anteriorly, radiates to the back, worsens with eating and movement, accompanied by nausea, constant dullness, and looser stools, what are the possible differential diagnoses?

Differential Diagnoses for Left Upper Abdominal Pain

The most likely differential diagnoses in this 30-year-old woman are pancreatitis, peptic ulcer disease (particularly gastric ulcer), functional dyspepsia, and less commonly, splenic pathology or colonic disorders.

Primary Considerations

Pancreatitis

This is a leading consideration given the classic presentation:

• Pain radiating to the back is highly characteristic of pancreatic pathology 1
• Worsening with eating (postprandial exacerbation) is typical
• Nausea and looser stools fit with pancreatic insufficiency or inflammation
• The constant dullness suggests ongoing inflammation rather than intermittent obstruction

Common pitfall: Lipase may be normal early in chronic pancreatitis or during acute-on-chronic episodes 2. If clinical suspicion is high, repeat testing and imaging (CT or MRI) are warranted.

Gastric Ulcer

This warrants strong consideration because:

• Gastric ulcer pain specifically localizes to the left hypochondrium in 17% of cases (compared to only 4-5% for other conditions) 3
• Pain worsening with eating is more typical of gastric than duodenal ulcers
• Radiation to the back occurs in 31% of peptic ulcer cases 3
• The age and gender fit the typical demographic

Functional Dyspepsia

This is statistically the most common diagnosis (>50% of patients with upper GI symptoms) 4, but should be a diagnosis of exclusion:

• Presents with epigastric pain, early satiety, and postprandial nausea 5
• Back radiation is less common (20%) compared to organic causes 3
• Does not typically cause loose stools

Secondary Considerations

Splenic Pathology

• Left upper quadrant location fits anatomically
• Consider splenic infarction, subcapsular hematoma, or splenomegaly
• Movement-related pain suggests peritoneal irritation

Colonic Disorders (Splenic Flexure)

• The looser stools and left-sided location raise this possibility
• Splenic flexure syndrome or colitis could present this way
• Less likely to radiate to back

Biliary Disease

• Fatty food precipitation occurs in 40% of biliary disease 3
• However, biliary pain typically localizes to the right upper quadrant
• Back radiation does occur in 35% of biliary cases 3

Critical Red Flags to Exclude

Immediately life-threatening conditions that must be ruled out:

• Ectopic pregnancy - mandatory β-hCG in any woman of childbearing age with abdominal pain, as upper abdominal ectopic pregnancy can mimic GI pathology 6
• Acute aortic syndromes - though less likely without vascular risk factors
• Myocardial infarction - women can present atypically with epigastric pain

Recommended Diagnostic Approach

For patients under 55 without alarm features (weight loss, dysphagia, bleeding, anemia, persistent vomiting):

1. Obtain β-hCG immediately to exclude pregnancy-related pathology
2. Check lipase and liver enzymes - elevated lipase suggests pancreatitis; elevated transaminases may indicate biliary or hepatic pathology
3. Test for H. pylori via urea breath test or stool antigen 4
4. Consider empiric PPI trial for 4-8 weeks if H. pylori negative 4

If alarm features present or symptoms persist despite empiric therapy:

• Upper endoscopy is indicated to evaluate for peptic ulcer disease, gastritis, or malignancy 4
• CT abdomen with contrast to evaluate pancreas, spleen, and other solid organs 1

Key caveat: The combination of back radiation, postprandial worsening, and loose stools makes pancreatic pathology more likely than simple dyspepsia or GERD, warranting earlier imaging rather than prolonged empiric therapy.