Have you ever felt detached from the world, or felt like you don't belong in your own body when you look down at your hands? The psychological disorder depersonalization and derealization is this phenomenon more intense and prolonged. Depersonalization is when you feel cut off from yourself, and derealization is when you feel cut off from the world. Both the causes and treatment methods for both depersonalization and derealization are similar. To get diagnosed for this disorder, common processes undertaken include getting a doctor's evaluation, questionnaire tests, and structured interviews. Many patients often undergo psychotherapy to get treated for depersonalization and derealization.