<unk> , also known as<unk>  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. The cause of<unk>  is unknown. Risk factors include a family history of bipolar disorder.<unk>  differs from bipolar in that major depression and mania are not found. Treatment is generally achieved with counseling and mood stabilizers such as lithium. It is estimated that 0.4-1% of people have<unk>  at some point in their life. The disorder's onset typically occurs in late childhood to early adulthood. Males and females are affected equally often.
Cyclothymia
Substance use disorder
Dysthymia
Borderline personality disorder
Euthymia 
Bipolar disorder
Congenital athymia
Myokymia