Lower cholesterol
Control hypertension
Smoking cessation
Antiplatelets
Endarterectomy
Bypass grafting
Stenting
Vertebrobasilar insufficiency
Vestibular/otologic
Subglottic stenosis
Benign paroxysmal positional vertigo 
Carotid-cavernous fistula
Traumatic 
Sinus barotrauma
Infection