This system comes from the superstition of impurity during the menstruation period.

Secondary is caused by pelvic disease and is not linked to the menstruation period.

For example, her first menstruation period arrives and she develops a crush on her best friend Neal.

This includes brides before their marriage, and married women after their menstruation period or childbirth.

Alternatively, a single menstruation period may be defined as irregular if it is shorter than 21 days, or longer than 36 days.

Female vervets do not have external signs indicating a menstruation period, thus there are not elaborate social behaviors involving reproduction.

These sections are situated all over the villages; in nakamals, special spaces are provided for females when they are in their menstruation period.

With this in place, working women were given special treatment, restricting their ability to work overtime, on dangerous jobs, on night jobs, and allowing leave during menstruation periods.

The organisation's members have also campaigned against the adivasi tradition of forcing women to stay away from the village and take shelter in the forest during her menstruation period.

Why women have been ordained to substitute the fast of Ramadan, if it falls during their menstruation period, but the substitution of the daily prayers has been waived?

One recent study found 43% of women with MS regularly experienced worsening of their MS symptoms in the days just before or at the beginning of the menstruation period.

Just as divorce during menstruation is haram, it is likewise haram between menstruation periods (i.e., "the period of purity") if the husband has had intercourse with his wife following the termination of her previous period.

Artemisia californica (California Sagebrush), used by the Cahuilla and Tongva to alleviate menstrual cramps and menopause by taking it as a decoction, and consuming it regularly before the menstruation period.

Thousands of devotees from all over India gather on the occasion of Ambubachi Mela, which is celebrated to mark the menstruation period of the goddess and during which the sanctorum of the shrine remains closed to worshippers.