In the context of Transtorno depressivo recorrente, bipolar type I or Transtorno bipolar tipo II, there has been a regular seasonal padrão of onset and remissão of at least one type of episódio (i.e., depressive, manic, mixed, or hypomanic episodes), com a substantial majority of the relevant mood episodes corresponding to the seasonal padrão. (In bipolar type I and Transtorno bipolar tipo II, all types of mood episodes may not follow this padrão.) A seasonal padrão should be differentiated from an episódio that is coincidental com a particular season but predominantly related to a psychological stressor that regularly occurs at that time of the year (e.g., seasonal unemployment).