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Question of the Day

A 33-year-old woman presents to her general practitioner with a 2-day history of persistent right shoulder pain. She denies any trauma or recent strenuous activity involving her shoulder. On examination, the range of motion of the shoulder joint is full and painless, and there is no localized tenderness over the joint or surrounding muscles. She mentions that the pain is dull, aching, and seems to be radiating from her upper abdomen. She also reports intermittent nausea and right upper quadrant abdominal tenderness after eating fatty meals. What is the most likely source of her referred shoulder pain?
Answer Details
✅ Correct Answer: C. Gallbladder
📝 Explanation:

The patient's presentation with right shoulder pain, absence of musculoskeletal findings, and associated symptoms of biliary colic (nausea, right upper quadrant tenderness after fatty meals) strongly indicates gallbladder pathology. Irritation of the right hemidiaphragm by an inflamed gallbladder (cholecystitis) or biliary distension causes referred pain to the right shoulder via the phrenic nerve (C3-C5), which shares dermatomal innervation with the C4 shoulder region. This is a classic presentation of referred pain, as detailed in the South African Family Practice Manual (4th Edition).

🔤 Memory spark:

GB-R-SHOULDER

❌ Why Wrong:
A    The spleen is located in the left upper quadrant and would cause referred pain to the left shoulder (Kehr's sign) if irritated, not the right shoulder.
B    The stomach is primarily located in the left upper quadrant and epigastrium. While gastric pathology can cause epigastric pain, referred pain to the right shoulder is not typical. It would be more likely to cause left shoulder or epigastric pain if diaphragmatic irritation occurred.
D    The appendix is located in the right lower quadrant and typically causes periumbilical pain migrating to the right iliac fossa (McBurney's point), not referred pain to the shoulder.
E    The left kidney is located in the left flank and retroperitoneum. Pathology of the left kidney would typically cause left flank pain, potentially radiating to the groin, but not referred pain to the right shoulder.
🏥 Setting:

General Practice Clinic

⏰ Urgency:

Routine

🎯 Learning Objective:

Understand the mechanism of referred pain to the shoulder via the phrenic nerve and identify the gallbladder as a common source of right shoulder pain.

🗝️ Key Teaching:

- Mechanism of Referred Pain: Diaphragmatic irritation from abdominal organs is referred to the shoulder (C4 dermatome) via the phrenic nerve (C3-C5). - Right Shoulder Pain: Commonly caused by pathology of the liver or gallbladder irritating the right hemidiaphragm. Cholecystitis is a classic example. - Left Shoulder Pain (Kehr's Sign): Classically caused by splenic rupture irritating the left hemidiaphragm. Can also be caused by the stomach or pancreas. - Clinical Clues: Always consider referred pain when a patient has shoulder pain with a normal shoulder examination. Associated abdominal symptoms are key to diagnosis. - Boas' Sign: Hyperaesthesia below the right scapula, another sign of gallbladder inflammation.

💎 Clinical Pearls:

Think referred pain: 'Phrenic C4 Shoulder' - the Phrenic nerve (C3, C4, C5) irritates the diaphragm and refers pain to the C4 dermatome (shoulder). Right-sided organs (gallbladder, liver) refer to the right shoulder. Left-sided organs (spleen, stomach) refer to the left shoulder.

📖 Reference:

South African Family Practice Manual (4th Edition), Abdominal Pain

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