The article analyzes the medical category of psychasthenia, used by French psychiatry from the late nineteenth through the early twentieth centuries. It describes the clinical profile of psychasthenia and the main hypotheses meant to account for symptoms as defined and advanced by Pierre Janet, the central figure in systematization of this category. The article also looks at how this diagnosis was used in Brazil and how it related to the profile of neurasthenia within the context of Brazilian psychiatry.
psychasthenia; Pierre Janet (1859-1947); psychiatry; Brazil