Abstract
The evidence indicating that puerperal psychosis is a nosological entity is reviewed. The psychosis most closely resembling puerperal psychosis is the schizophreniform variant of manic-depression; if marked differences can be found between that state and puerperal psychosis, then the finding will tend to confirm the separateness of puerperal psychosis. Two such sets of patients are compared and the claim of puerperal psychosis to the status of a nosological entity is further supported.