Severe dizziness can be constant or paroxysmal, occurs with vestibular neuronitis, pathologies of the inner ear, cerebrovascular accidents, idiopathic vestibular insufficiency, some cardiac pathologies, intoxication, severe anemia, panic attacks. It is diagnosed on the basis of survey data, neurological examination, studies of the vestibular apparatus, imaging, laboratory techniques. Treatment includes neuroprotective agents, vascular agents, analgesics, anticonvulsants, and other drugs. Some patients require surgery.