1. Vestibular disorders disrupt balance and cause dizziness through loss of function in the vestibular system. 2. Treatment involves symptomatic relief through medications and vestibular rehabilitation exercises to restore balance. 3. Common etiologies like vestibular neuritis and Meniere's disease are treated with anti-inflammatory steroids and diuretics respectively, while BPPV often responds to repositioning maneuvers to move debris in semicircular canals.