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.

By Steven Reinberg
HealthDay Reporter
One in seven women suffers from depression before, during or after pregnancy, a new study finds.

The consequences of depression can be devastating to the mother, her baby and her entire family, according to the report in the October issue of The American Journal of Psychiatry.

"The prevalence of women diagnosed with depression before, during and after pregnancy was pretty similar," said lead author Patricia Dietz, an epidemiologist at the U.S. Centers for Disease Control and Prevention's Division of Reproductive Health.