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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.
One usually predominates and ruptures mid-cycle, liberating the egg. When the lining of the uterus is shed, bleeding occurs and clots form. If the uterus holds onto the clots, they will break down and the blood darken, resulting in a dark menstrual flow.