By eHow Health Editor
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Having heavy menstrual periods on a regular basis is known in the medical industry as menorrhagia. The length of an average period should be 5 to 7 days, and the amount of blood lost during that week should only be 1 to 2 ounces. If your periods are heavy though, they usually last for longer than 7 days, and the blood lost could be up to 30 ounces.
eHow Health Editor