I found this video by accident, but it's worth watching. It's not a pleasant topic, speaking as a woman who suffers from it every month, but it's interesting to explore. Both medically and historically. I prefer to share on my blogs information that can serve both as an educational / informational function, and something that can help creative people. And this video, in my opinion, is also useful for those who write books, draw their own stories or play tabletop role-playing games. Such knowledge can help, for example, in DnD, if you have created a character whose life is connected with medicine. I understand that such "toilet" themes in comics, TRPGs, and other creative projects are usually bypassed. However, there are situations when such topics are still present, and in this case, I think that knowledge will benefit the author and his audience.