Irregular menstruation
Encyclopedia
Irregular menstruation is an abnormal variation in length of menstrual cycle
Menstrual cycle
The menstrual cycle is the scientific term for the physiological changes that can occur in fertile women for the purpose of sexual reproduction. This article focuses on the human menstrual cycle....

s in a woman. Normally, it is actually unusual for a woman to experience cycle length variations of less than four days between the shortest and longest cycle lengths. However, length variation between eight and 20 days is considered as moderately irregular cycles. Variation of 21 days or more is considered very irregular. Alternatively, an irregular menstruation period may be defined as one shorter than 21 days, or longer than 36 days.

Types

The term metrorrhagia
Metrorrhagia
Metrorrhagia, also known as breakthrough bleeding or spotting, is uterine bleeding at irregular intervals, particularly between the expected menstrual periods.In some women, menstrual spotting between periods occurs as a normal and harmless part of ovulation...

 is often used for irregular menstruation that occurs between the expected menstrual periods.

Oligomenorrhea
Oligomenorrhea
Oligomenorrhea is infrequent menstruation. More strictly, it is menstrual periods occurring at intervals of greater than 35 days, with only four to nine periods in a year. Also, menstrual periods should have been regularly established previously before the development of infrequent flow...

is infrequent or very light menstruation, Also, menstrual periods should have been regularly established previously before the development of infrequent flow. and often (but not always) involves irregular intervals.
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK