osuche, from what I understand, it's a fluctuation in hormones, which explains why this happens right before your period. I have that happen, too. Another time of the month this may happen is when you ovulate, usually around the middle of your cycle, or any other time there is a hormone fluctuation.

Tylenol does help, as does (from what I've read) like a hot water bottle or other moist heat.

Hope this helps!

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