Severe dizziness is possible with vestibular paroxysms, BPPV, cardiac arrhythmias, transient ischemic attacks, Meniere's disease, Lermoyer's syndrome, labyrinthitis, temporal lobe epilepsy, perilymphatic fistula, panic attacks. It is manifested by an attack of a pronounced sensation of rotation or displacement of the patient, less often - of the surrounding space. To clarify the diagnosis, a neurological examination is performed, studies to assess the vestibular analyzer, EEG, CT, MRI. Treatment includes antipsychotics, antihistamines, antiplatelet agents, anticoagulants, and other agents. Surgical interventions are carried out according to indications.