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Quick Answer. During a menstrual cycle, the blood may become dark red or brown near the end of the cycle because the blood is older and is not being released as quickly. This is a normal color change during a menstrual cycle, explains WebMD. Continue Reading.
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