menstruation

For him, periods are a matter of health, not embarrassment and while the idea of dads discussing menstruation still divides opinion, John says it's important to "be there and approachable for your children".

Women say that unlike menstruation and pregnancy, guidance from doctors about menopause can be hard to come by, so they often struggle to find the source of their ailments.

Calli finds she "lives" by her menstruation tracker, as being on her period is a source of anxiety "especially when I've got big races coming up".

A staff member at Gengdan Institute told local outlet Dute News that the school may have created the rule about proving menstruation in order to deter students from faking periods to get sick notes.

While it establishes federal standards to protect the privacy and security of individuals’ health information, it doesn’t cover apps that track users’ fitness goals, menstruation and mental health.