Dizziness may be defined as the sensation of lightheadedness, loss of balance, or unsteadiness. This may be associated with disequilibrium or vertigo. Initial care of dizziness is geared toward discerning a cause for the dizziness. Causes are widely varied and include disease of the ear, brain, heart, blood vessels (vascular disease), and nerves. Testing may be necessary to find a diagnosis and then guide treatment.