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Retained menses: These can be another reason for black period blood. It would mean that the menses are being retained in the uterus or in vagina. It can be retained in vagina, the hymen covers the vagina completely and does not allow blood to flow out until pushed by contractions from uterus.
Explaining the Underlying Causes. Having brown period blood is COMPLETELY normal. It is called âold bloodâ and comes out either at the start or end of a womanâs period. In the middle of menstruation, this is heavier and takes a pink or red color. Blood becomes brown because of its iron content â iron turns brown when it is exposed to air.