Which diagnosis should IMMEDIATELY rise to the top of your differential?
2/3
Your Turn
Which diagnosis is MOST concerning?
If you chose A...
✕ Not this time.
Why?
✓Migraines can cause severe headaches, photophobia, and nausea.
⚠But the key word is thunderclap. Migraines build gradually. SAH reaches maximum intensity within seconds.
💡 CJMM PEARL
The SPEED of onset is the critical cue. "Worst headache of my life" that peaks instantly is SAH until proven otherwise.
Curious about the other choices?
If you chose B...
! Understandable, but not the priority.
Why?
✓Meningitis causes severe headache, photophobia, neck stiffness, and nausea. The overlap is real.
!But meningitis develops progressively over hours to days, often with fever. This patient's headache reached maximum intensity instantly.
🔍 The clue that changes everything:
Both conditions irritate the meninges, which is why the symptoms overlap. But SAH is a thunderclap onset. Meningitis is a progressive onset. The story of onset separates them.
💡 CJMM PEARL
Similar symptoms. Different causes. The story is the key.
Curious about the other choices?
If you chose C...
✓ Excellent choice!
Why?
💡"Worst headache of my life" with thunderclap onset is SAH until proven otherwise.
✓A cerebral aneurysm ruptures and blood enters the subarachnoid space. Blood irritates the meninges, causing neck stiffness and photophobia, which is why it mimics meningitis.
✓This patient needs emergency non-contrast head CT immediately. Every minute matters.
⭐ You recognized the thunderclap pattern.
The speed of onset was the critical cue. You treated the story, not just the symptoms.
Curious about the other choices?
If you chose D...
✕ Not quite.
Why?
✓Hypertensive urgency can cause severe headaches, and BP is often elevated in SAH as the body tries to maintain cerebral perfusion.
⚠But hypertensive urgency doesn't explain the thunderclap onset, neck stiffness, or photophobia together.
💡 CJMM PEARL
An elevated BP in a patient with "worst headache of my life" should raise your suspicion for SAH, not reassure you that hypertension is the cause. Treat the whole picture.
Curious about the other choices?
3/3
CJMM Debrief
This question wasn't really about memorizing diagnoses. It was about recognizing that the story of onset separates life-threatening emergencies from common conditions with overlapping symptoms.
🔍
Recognize cues
What's going on?
🧠
Analyze cues
What do they mean?
📋
Prioritize hypotheses
What's the priority?
🏃
Generate solutions
What can we do?
✓
Take action
Do the right thing.
📈
Evaluate outcomes
Did it help?
🎯 THE TAKEAWAY
Neck stiffness and photophobia do NOT automatically mean meningitis.
Ask: did this headache reach maximum intensity within seconds? If yes, treat it as SAH until the CT says otherwise.