What can cause sudden dizziness?

Many things. The cause of your dizziness can only be determined by a careful history in regards to what you experience when you feel dizzy, how long it lasts, what other symptoms it is associated with you. The determination begins with your doctor.
BPPV. Benign paroxysmal positional vertigo is a n inner ear problem where the crystals inside the ear are dislodged and then caught in the semi-circular canals causing the dizziness. Other possibilities are: low blood pressure, low blood o2, low blood sugar, or hyperventilation, yo name a few.

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