WordNet

an irregular asymmetry in shape; an irregular spatial pattern (同)geometrical irregularity
not characterized by a fixed principle or rate; at irregular intervals (同)unregularity
of or relating to menstruation or the menses; "menstrual period" (同)catamenial

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〈U〉不規則;不ぞろい / 〈C〉不規則(不ぞろい)なもの / 〈C〉不品行;不法行為
月経の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/01/25 04:59:12」(JST)

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Irregular menstruation is a menstrual disorder whose manifestations include irregular cycle lengths as well as metrorrhagia (vaginal bleeding between expected periods).

Irregular cycles or periods

Irregular cycles or irregular periods is an abnormal variation in length of menstrual cycles in a female. A female usually experiences cycle length variations of up to eight days between the shortest and longest cycle lengths. Lengths ranging between eight and 20 days are considered moderately irregular.^[1] Variation of 21 days or more is considered very irregular.^[1]

Alternatively, a single menstruation period may be defined as irregular if it is shorter than 21 days, or longer than 36 days.^[2] However, if they are regularly shorter than 21 days, or longer than 36 (or 35^[3]) days, the condition would rather be termed polymenorrhea or oligomenorrhea, respectively.

Other types

Other types of conditions that can be referred to by "irregular menstruation" include:

Metrorrhagia, which generally refers to vaginal bleeding that occurs between the expected menstrual periods.^[4] The distinction between irregular cycle lengths and metrorrhagia is not always clear, and may depend on whether the bleeding is regarded as marking the menstrual period (favoring the term "irregular cycles") or being separate from it (favoring the term "metrorrhagia").
Oligomenorrhea generally refers to infrequent menstruation,^[3] More strictly, it is menstrual periods occurring at intervals of greater than 35 days, with only four to nine periods in a year.^[3] Also, menstrual periods should have been regularly established previously before the development of infrequent flow.^[3] and often (but not always) involves irregular intervals. In contrast to "irregular cycles", the interval between one cycle and the next may still be consistent, but can still be regarded as "irregular" compared to the cycle length of a female without oligomenorrhea. Still, females with oligomenorrhea often have irregular cycles as well.
Polymenorrhea is the medical term for cycles with intervals of 21 days or fewer. This can be regarded as the opposite of oligomenorrhea.

References

^ ^a ^b Kippley, John; Sheila Kippley (1996). The Art of Natural Family Planning (4th ed.). Cincinnati, OH: The Couple to Couple League. p. 92. ISBN 0-926412-13-2.
^ about.com > If I Have Irregular Periods, Will I Have Trouble Getting Pregnant? By Rachel Gurevich. Updated October 26, 2009
^ ^a ^b ^c ^d thefreedictionary.com > oligomenorrhea This dictionary, in turn, is citing: Gale Encyclopedia of Medicine. 2008
^ MedicineNet.com > Definition of Metrorrhagia Last Editorial Review: 3/17/2003

UpToDate Contents

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1. 妊娠していない生殖可能年齢の女性における不正子宮出血に対するアプローチ approach to abnormal uterine bleeding in nonpregnant reproductive age women
2. 思春期における異常子宮出血：鑑別診断およびアプローチ abnormal uterine bleeding in adolescents differential diagnosis and approach
3. 思春期の異常子宮出血：マネージメント abnormal uterine bleeding in adolescents management
4. 思春期における異常子宮出血：定義および評価 abnormal uterine bleeding in adolescents definition and evaluation
5. 思春期における多嚢胞性卵巣症候群の診断的評価 diagnostic evaluation of polycystic ovary syndrome in adolescents

English Journal

Association between the CLOCK gene 3111 T > C polymorphism and an irregular menstrual cycle in Korean adolescents.

Kim KH1, Kim Y2, Ha J3, Shin DW2, Shin YC2, Oh KS2, Woo HY4, Lim SW2.
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The menstrual cycle is an example of a human infradian rhythm, but an altered sleep-wake cycle or a disrupted circadian rhythm can change the regularity of the menstrual cycle. In this study, we investigated whether an irregular menstrual cycle is associated with polymorphisms in the CLOCK (3111T
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AMERICAN ASSOCIATION OF CLINICAL ENDOCRINOLOGISTS, AMERICAN COLLEGE OF ENDOCRINOLOGY, AND ANDROGEN EXCESS AND PCOS SOCIETY DISEASE STATE CLINICAL REVIEW: GUIDE TO THE BEST PRACTICES IN THE EVALUATION AND TREATMENT OF POLYCYSTIC OVARY SYNDROME - PART 1.

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PMID 26509855

Adolescence and polycystic ovary syndrome: current concepts on diagnosis and treatment.

Spritzer PM1, Motta AB2.
International journal of clinical practice.Int J Clin Pract.2015 Nov;69(11):1236-46. doi: 10.1111/ijcp.12719. Epub 2015 Aug 19.
BACKGROUND: Adolescence is a time characterised by changes in reproductive hormones and menstrual patterns, which makes it difficult to diagnose polycystic ovary syndrome (PCOS) in this population. The diagnosis of PCOS has a great physical and psychosocial impact on the young person. Despite the im
PMID 26289303

Japanese Journal

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多のう胞性卵巣症候群に対する鍼治療の効果

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腹水細胞診陽性であった成人型顆粒膜細胞腫の 3 例

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