I'm a 48yr old woman, in excellent health. I have not had a period for the last 3 months. I have always been regular, almost to the time of day. During the last year and a half, my periods have been fairly heavy, with the very occasional lighter one. And now nothing for 3 months. No hot flashes, no mood swings, I actually feel great! Should I be concerned? What could possibly be the cause of no periods? Thanks for any info!