• What it is: Otoconia displaced into a semicircular canal (ear crystals where they shouldn’t be).
• Classic signs: Brief vertigo (<60 sec), triggered by position changes, upbeating torsional nystagmus, no hearing loss.
• Rule-in test: Dix-Hallpike.
• Rule-out clues: Long-lasting vertigo, neuro deficits, hearing symptoms → think neuritis/Ménière’s.
• NPTE trap: Nystagmus >60 seconds = NOT typical BPPV (think cupulolithiasis).
• Best treatment: Epley every. single. time.
• Mock question included: Yes — test yourself before you move on.

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