The essential feature is a persistent instability of mood, involving
numerous periods of mild depression and mild elation, none of which
has been sufficiently severe or prolonged to fulfil the criteria for
bipolar affective disorder or recurrent depressive disorder. This
implies that individual episodes of mood swings do not fulfil the
criteria for any of the categories described under manic episode or
- affective personality disorder
- cycloid personality
- cyclothymic personality
This disorder is common in the relatives of patients with bipolar
affective disorder and some individuals with cyclothymia eventually
develop bipolar affective disorder themselves. It may persist throughout
adult life, cease temporarily or permanently, or develop into more
severe mood swings meeting the criteria for bipolar affective disorder
or recurrent depressive disorder.
ICD-10 copyright © 1992 by World Health Organization.
Diagnostic Criteria For Cyclothymia From the DSM IV:
- For at least 2 years, the presence of numerous periods with hypomanic
symptoms and numerous periods with depressive symptoms that do not meet
criteria for a Major Depressive Episode.
- Note: In children and adolescents, the duration must be at least
- During the above 2-year period (1 year in children and adolescents),
the person has not been without the symptoms in Criterion A for more
than 2 months at a time.
- No Major Depressive Episode, Manic Episode, or Mixed Episode has
been present during the first 2 years of the disturbance.
- Note: After the initial 2 years (1 year in children and adolescents)
of Cyclothymic Disorder, there may be superimposed Manic or Mixed Episodes
(in which case both Bipolar I Disorder and Cyclothymic Disorder may
be diagnosed) or Major Depressive Episodes (in which case both Bipolar
II Disorder and Cyclothymic Disorder may be diagnosed).
- The symptoms in Criterion A are not better accounted for by Schizoaffective
Disorder and are not superimposed on Schizophrenia, Schizophreniform
Disorder, Delusional Disorder, or Psychotic Disorder Not Otherwise Specified.
- The symptoms are not due to the direct physiological effects of a
substance (e.g., a drug of abuse, a medication) or a general medical
condition (e.g., hyperthyroidism).
- The symptoms cause clinically significant distress or impairment
in social, occupational, or other important areas of functioning.
Bipolar 1 | Bipolar
II | Bipolar III | Cyclothymic Disorder
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