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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.
Menstrual Black Blood Remedy | Dark Brown Menstrual Bleeding Treatment. Black Blood in Menstruation: Because menstruation is a regular discharge of blood from the female body that was used to line up the uterine wall, any discoloration commonly causes alarm. This is because the normal color of menstrual flow is red.