How does Benign Paroxysmal Positional Vertigo (BPPV) cause sudden dizziness?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Benign Paroxysmal Positional Vertigo (BPPV) is a common inner ear disorder that causes sudden, short episodes of dizziness or spinning. It happens when tiny calcium crystals (otoconia) inside your ear become dislodged and move into the semicircular canals, where they don't belong. This disrupts the signals your inner ear sends to your brain about balance and head position, triggering vertigo—especially with certain movements like tilting your head, rolling over in bed, or looking up.

Because dizziness can stem from many different conditions, it's important to identify the root cause quickly. Take a free, instant, online symptom check to better understand what may be causing your symptoms and get clear guidance on your next steps.

Reviewed for medical accuracy: 07/15/2026

Important Next Steps

Learn if sudden dizziness needs care now Discover likely causes of your vertigo See whether dizziness could be BPPV Find OTC options for dizziness relief Find a vestibular specialist near you Discover home remedies for vertigo relief Understand if spinning dizziness is serious

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Explanation

Benign Paroxysmal Positional Vertigo (BPPV) is a condition that causes sudden dizziness. This happens because small crystals inside your ear, which help with balance, get dislodged and move into parts of the ear where they shouldn't be. This movement sends mixed signals to your brain, making you feel dizzy or like the room is spinning.

How BPPV Works

Crystals in the Ear: Normally, these crystals help you sense movement and balance.
Dislodged Crystals: Sometimes, they become loose and move into the wrong part of the ear.
Confused Signals: This confuses your brain and causes dizziness, especially when you change positions like getting up or lying down.

If you're experiencing sudden dizziness or vertigo, you can check your symptoms to better understand what might be causing your discomfort and whether you should seek medical care. While BPPV can be uncomfortable, it is generally not serious and can often be treated with specific head movements or exercises. These treatments aim to move the crystals back to where they belong.

(References)

Lempert T. (2012). Recurrent spontaneous attacks of dizziness. Continuum (Minneapolis, Minn.), 23042061.
Yang J, Xiong G, Lu H, Luo X, Xie X, & Shao A. (2025). Residual Dizziness Characteristics of Idiopathic Sudden .... Audiology & neuro-otology, 39068920.
Kornhuber HH. (1976). [Differential diagnosis of dizziness (author's transl)]. Archives of oto-rhino-laryngology, 990084.

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