The chaupadi tradition is a practice in rural parts of Nepal where women are literally put in isolation during their period. The reason stems from menstruating women being considered “unclean”. Women aren’t even let into classrooms with other students while menstruating.
The myth goes back to very old (and outdated) beliefs that a woman’s uncleanliness will anger goddesses. One would think that a female goddess would be more understanding than people tend to be. Still, dispelling myths like chaupadi where 16 percent of women in Nepal are forced from their homes into isolation is a task that will take effort, education, and awareness.