A new study links stress to infertility.
Researchers from Ohio State University followed about 400 couples for up to a year as the couples tried to conceive.
They found that women who had the highest level of a certain stress biomarker also had a "29-percent decreased probability of pregnancy over time."
By the end of the study those same women also had a two-fold increased risk of infertility.
Keep in mind the study shows associations, not causes.
Researchers did not investigate why stress might lead to infertility.
The study was published in the journal Human Reproduction.
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