When menstruating, do you have to use two pads at once or replace them every hour? If so, let's see what are the possible causes of lots of menstrual blood. Actually the amount of bleeding during menstruation in each woman can be different. There is a little menstrual blood volume, but some are coming out a lot, even to excessive. Menstrual Blood Comes Out Much Menstrual blood that comes out is considered too much if it exceeds 80 ml in one menstrual cycle. But of course the amount of blood that comes out during menstruation is difficult to count. In general, excessive menstrual blood can be characterized by: Menstruation for more than 7 days. Must replace pads every 1-2 hours because it is full. There is a blood clot the size of a coin. Menstrual blood penetrates into outer pants or sheets. Have to replace pads in the middle of the night because it's full. Menstrual blood that comes out too much can interfere with activity, even causing weakness or shortness of b...