MONDAY, June 16 (HealthDay News) -- A method for predicting which teenage female athletes are at risk to stop menstruating -- an important factor in causing the bones to lose mass -- may have been found, according to a preliminary study.

Up to 25 percent of female high school athletes develop amenorrhea, or absence of menstruation, compared with 2 percent to 5 percent in the general population, researchers from Massachusetts General Hospital in Boston found.

The report was expected to be presented Monday at The Endocrine Society's annual meeting in San Francisco.

FRIDAY, June 13 (HealthDay News) -- Having delayed sleep phase syndrome (DSPS) appears to be linked to irregular menstrual cycles and increased premenstrual symptoms in women, according to a new report.

DSPS occurs when your internal clock is naturally out of sync with real time, so that staying up late and having difficulty waking early is your norm. It is unlike such conditions as jet lag, because external factors (time zone change, noise, light) do not cause your internal clock to desynchronize.

I'm looking for more info on PMS. Anyone have any trusted resources they would recommend?

I am a 29 year old woman who has had several health problems - nothing major, but big enough to effect my daily life and quality of life. However, recently I was introduced to Reliv, a complete nutritional supplement, by a friend. I have only been on it for two months, but already my constant headaches are gone, my acid reflux is gone, and my skin has cleared up. Also I went to the doctor for blood work to see how it has affected my thyroid and that has improved and I have lost 20lbs in these last two months!! That is huge for me!

Kristin Park shares her story on Postpartum Depression.

Share Your Story Right Now. Help us tap into the strength of women by sharing your story now.

Has birth-control improved your PMS symptoms? Help us tap into the strength of women by sharing your story now.

Follow Leigh Ann's lead. Help us tap into the strength of women by sharing your story now.

Dr. Leon Speroff recently stepped down as director for the Women's Health Research Unit at Oregon Health & Science University

EmpowHer: Dr. Speroff, can you explain the World Health Initiative & if HRT is safe?

Dr. Speroff: I am Leon Speroff, Professor of Obstetrics and Gynecology at Oregon Health and Science University and a sub-specialist in reproductive endocrinology. Let me offer a health tip for you.