The first menstrual period occurs after the onset of pubertal growth, and is called menarche. The average age of menarche i… 展开

In most women, various physical changes are brought about by fluctuations in hormone levels during the menstrual cycle. This includes muscle contractions of the uterus (menstrual cramping) that can precede or acco… 展开

Infrequent or irregular ovulation is called oligoovulation. The absence of ovulation is called anovulation. Normal menstrual flow can occur without ovulation preceding it: an anovulatory cycle. In some cycles, follicular development ma… 展开

Menstrual products (also called "feminine hygiene" products) are made to absorb or catch menstrual blood. A number of different products are available – some are disposable, some are reusable. Where women can affor… 展开

Menstruation can be delayed by the use of progesterone or progestins. For this purpose, oral administration of progesterone or progestin during cycle day 20 has been found to effectively delay menstruation for … 展开

The word menstruation is etymologically related to moon. The terms menstruation and menses are derived from the Latin mensis 'month', which in turn relates to the ancient Greek mene 'moon' and to the roots of the English w… 展开