In research, heavy menstrual bleeding is considered to be 60-80ml (millilitres) or more per cycle (the average amount of blood lost is 30-40ml, and 90% of women lose less than 80ml). However, in reality, it is difficult to quantify objectively what heavy blood loss is, and most women have a good idea about how much bleeding is normal for them during their period, and can tell when this amount increases or decreases.
If your periods are causing disruption to your everyday life, or they are heavier than usual, you should speak to your GP about it. If you feel that you are using an unusually high number of tampons or pads, experience flooding through to your clothes or bedding, or you need to use tampons and towels together, it is a good indication that your blood loss is excessive.
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