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Cyclothymia (ˌsaɪkləˈθaɪmiə ), 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. The cause of cyclothymia is unknown. Risk factors include a family history of bipolar disorder. Cyclothymia 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 0.41% of people have cyclothymia 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. People with cyclothymia experience both depressive phases and hypomanic phases (which are less severe than full manic episodes). The depressive and hypomanic symptoms in cyclothymia last for variable amounts of time due to the unstable and reactive nature of the disorder. The depressive phases are similar to major depressive disorder and are characterized by dulled thoughts and sensations and the lack of motivation for intellectual or social activities. Most people with cyclothymia are generally fatigued and tend to sleep frequently and for long periods of time. However, other people experience insomnia. Other symptoms of cyclothymic depression include indifference toward people or activities that used to be extremely important. Cyclothymic depression also leads to difficulty making decisions. In addition, people with this condition tend to be critical and complain easily. Suicidal thoughts are common, even in mild forms of cyclothymia. In the depressive state, people with cyclothymia also experience physical complaints including frequent headaches, tightness in the head and chest, an empty sensation in the head, weakness, weight loss, and hair loss.