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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). The possible causes of irregular menstruation may vary. The common factors of it are related to lifestyle, such as stress, body weight, and smoking status. [1]
The term metrorrhagia is often used for irregular menstruation that occurs between the expected menstrual periods. [9] [10] Oligomenorrhea is the medical term for infrequent, often light menstrual periods (intervals exceeding 35 days). [11] Polymenorrhea is the medical term for cycles with intervals of 21 days or fewer.
Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...
Progesterone: Women with PCOS often have low levels of progesterone, as irregular ovulation leads to fewer cycles where progesterone is produced after ovulation.
In the 1920s, Kyusaku Ogino, a Japanese gynecologist, and Hermann Knaus, from Austria, working independently, each made the discovery that ovulation occurs about fourteen days before the next menstrual period. [13] Ogino used his discovery to develop a formula for use in aiding infertile women to time intercourse to achieve pregnancy.
But to the best of the U.S.’s ability to calculate them, it appears that rates of infertility have plateaued in recent years, according to a 2022 analysis, with fluctuations that have ranged ...