Period

Found this from internet.

I've been experiencing it for years. The first time, I couldn't help myself but panicked if I'd sneezed and found fragments of my brain in the tissue papers. I am afraid I might be dying, until mom had found me washing out a bloody rag and explained that bleeding was just part of being a woman. It shows the sign of woman cave had finally exited inside the body, and it is where the blood comes from every month. - Memoir of Geisha, Arthur Golden

very well explained.