To meet the diagnostic criteria for Cyclothymia, the individual must have experienced mood swings that are not as severe as those in full bipolar disorder. The length of the mood swing can be longer, however and can develop into full bipolar disorder. | To meet the diagnostic criteria for Cyclothymia, the individual must have experienced mood swings that are not as severe as those in full bipolar disorder. The length of the mood swing can be longer, however and can develop into full bipolar disorder. |