Menstruation can cause temporary anemia.

This is indeed possible. During menstruation, about 30 milliliters of blood are lost, but some women can lose up to 80 milliliters. In these cases, temporary anemia can occur.

The duration of menstruation varies according to the climate.

This is correct. In countries with distinct seasons, it has been shown that women experience more discomfort in winter. According to experts, there is greater ovarian activity in summer, resulting in shorter cycles.

When a group of women spend a lot of time together, their periods synchronize.

This sounds super romantic, but it’s not true. According to studies, simply being around other women doesn’t mean your periods will synchronize.