News1 min ago
heavy periods
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just how long does a period have to be before it is considered abnormal?
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For more on marking an answer as the "Best Answer", please visit our FAQ.Most girls periods last between three and four days, but it would only be viewed as unusual (Menorrhagia) if it went on for more than seven days.
The attached website is excellent.
http://kidshealth.org/parent/growth/growing/menstrual_problems.html