There are several reasons you could be missing periods, and an ob/gyn doctor could discuss this with you.

Some of the top options are: 1)low fat to body weight, which is when women athletes get too low in body fat and too high in stress to menstrate. 2) low estrogen, which can happen anytime but is usually in the teen years and toward menopause 3)pregnancy 4)estrogen/progesterone imbalance, which occurs in heavier women when the estrogen is not processed correctly.

I hope this is helpful. Christopher Maloney, Naturopathic Doctor Augusta and Portland, Maine www.maloneymedical.com Individualized research available for a fee. Informational only, I cannot treat or diagnose via the web.