its actually called amenorrhea or sumting like dat...gals who diet tto much...xcercise too much n sumting else i cant remember...my fren had it b4..its very common for athletes...u must go c a doc and eat hormon pills to get bck d period..wen u stop getting yr period...d effect is like menopous...u stop producing progesterone..therefore yr bone density will drop at a great level..its badnews..but good ting bt it is u can hv sex all day long n not to worry bt getting pregnant..hehhe