Most of the blood shed with the endometrial lining during a period is passed out through the cervix and then the vagina. During a period, if the internal pelvic organs are inspected by a gynaecologist (e.g. laparoscopy laparoscopy) there is almost invariably a little blood that has tracked up through the Fallopian tubes. This blood may irritate the peritoneum (Q 2.4) resulting in pain (peritonism).
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