Cyclothymia (/ˌsaɪkləˈθaɪmiə/ siy-kluh-THIY-mee-uh), also known as cyclothymic disorder, psychothemia/psychothymia, bipolar III, affective personality disorder and cyclothymic personality disorder, is a mental and behavioural disorder that involves numerous periods of symptoms of depression and periods of symptoms of elevated mood. These symptoms, however, are not sufficient to indicate a major depressive episode or a manic episode. Symptoms must last for more than one year in children and two years in adults.