Fire breathing and menstruation

Body: 

Why is it that we are not suppose to do fire breathing while we are menstruating? I tried to search for info, and even googled it, but couldn't really find a good explanation.

Graceful, here's an old thread in which that was discussed:

http://www.wholewoman.com/forum/node/4222

Thank you surviving! Didn't use the right search words.
Wow! Lots of good information on that thread! Again, thanks so much!!!