Menstruation
Menstruation is the most visible phase of the menstrual cycle and its beginning is used as the marker between cycles. The first day of menstrual bleeding is the date used for the last menstrual period (LMP). The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 31 days in adults (an average of 28 days).
Menstrual cup
While numerous companies all over the world offer this product it was still not well known in around 2010. It may be difficult for companies to make profit from this product as one single menstrual cup can last a girl or woman five years or longer. Most women hear of menstrual cups through the internet or word of mouth, rather than through conventional advertizing on TV for example. As of 2018, menstrual cups are mentioned more and more often alongside tampons and pads in publications about menstrual hygiene management.