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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.
Causes of Black blood during period. Black blood is not a very serious problem or disease and can be taken lightly. But if it is accompanied by severe pain, cramping or the span of menstrual cycle is extended to more number of days than usual, it may indicate the onset of something serious.