A patient with bipolar disorder will often cycle between depression and mania/hypomania. Terms have been used to define the frequency of these cycles.
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Cycling Term
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Cycling Frequency (after Suppes et al)
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non-rapid
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0 to 3 episodes per year
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rapid
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>= 4 episodes per year but not ultra-rapid
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ultra-rapid
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>= 4 episodes per month ("weekly") but not ultradian
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ultradian (ultra-ultra rapid)
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>= 1 episode per day in >= 4 days per week
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where:
• Ultradian indicates a recurrent cycle with a period less than 24 hours.
