what are the causes of vertigo?
Vertigo may also be caused by inflammation within the inner ear (labyrinthitis or vestibular neuritis), which is characterized by the sudden onset of vertigo and may be associated with hearing loss. The most common cause of labyrinthitis is a viral or bacterial inner ear infection.
1 Symptoms may include vertigo with one-sided ringing in the ear and hearing loss.  Vertigo can be caused by decreased blood flow to the base of the brain. A blood clot or blockage in a blood vessel in the back of the brain can cause a stroke (cerebral vascular accident or CVA).