In an analysis of 3.4 million women under age 40, researchers in Japan found a strong association between menstrual-related disorders (ie, endometriosis or dysmenorrhea) and diagnosed sexually transmitted infections (STIs). Among the 257,897 women with these conditions, STI diagnoses were consistently 4.31–5.29 times more common than among women without the disorders, as published in PLOS One. Genital chlamydia infection showed the largest absolute difference, affecting 3.53% of women with menstrual-related disorders compared with 0.67% of …
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