Crystals in the inner ear can become disengaged and then find their way into the posterior semi-circular canal. This will interfere with the normal function and cause dizziness, positional vertigo or even nausea. These symptoms are often precipitated by a change of position of the head with respect to gravity. For example, turning in bed or looking up to the ceiling can trigger dizziness.

The most effective treatment for BPPV is a procedure called the Epley Manoeuvre or repositioning procedure. The procedure takes about 15 minutes and is effective in two to three treatments 80% of thetime when done by a trained health professional.