The<unk>  is a rare delusional misidentification syndrome in which a person experiences the delusion that they have a<unk> or Doppelgänger with the same appearance, but usually with different character traits, that is leading a life of its own. The syndrome is also called the syndrome of<unk>  of the self, delusion of<unk><unk> , or simply<unk><unk> . Sometimes, the patient is under the impression that there is more than one<unk>  A<unk> may be projected onto any person, from a stranger to a family member. This syndrome is often diagnosed during or after the onset of another mental disorder, such as schizophrenia or other disorders involving psychotic hallucinations. There is no widely accepted method of treatment, as most patients require individualized therapy. The prevalence of this disease is relatively low, as few cases have been reported since the disease was defined in 1978 by George Nikolaos Christodoulou (b.1935), a Greek-American Psychiatrist. However,<unk><unk>  is not clearly defined in literature, and therefore may be under-reported.
Syndrome of subjective doubles
Postorgasmic illness syndrome
Functional somatic syndrome
Paroxysmal extreme pain disorder
Vitreous touch syndrome
Nociplastic pain
Pseudobulbar affect
Feline hyperesthesia syndrome