A. Vertigo

1. ~90% are vestibular
2. Peripheral Vertigo (40%)
   1. Benign positional vertigo (~75%)
   2. Labyrinthitis (vestibular neuronitis)
   3. Menier's Disease
3. Central Vertigo
   1. Acoustic Neuroma
   2. Intracranial pressure abnormalities
   3. Idiopathic
4. Audiometry is helpful to distinguish
5. Nystagmus
   1. This is the major sign of true vertigo
   2. Vertical nystagmus is always abnormal

B. Presyncope / Syncope
C. Dysequilibrium

1. Peripheral neuropathy
2. Previous Stroke
3. Arthritis
4. Parkinson's Disease