Can Eating Raw Rice Result In Severe Period Pain?

i am addicted to eating raw rice. well i noticed when i am eating much, i suffer severe pain during my periods. I hear it can cause problems during pregnancy. I have been eating raw rice since 10 years. why is it a problem because its raw. Since i have been doing this over a long time, i still feel my body hasn't accustomed to it. you can please tell me more on this.