Welcome to the ehealthforum and I am really glad to help you out. The average blood loss during menstruation is 35 milliliters with 10-80 mL considered normal. Any blood loss during periods which is more than this can cause iron deficiency anemia and needs to be evaluated. A broken hymen does not make you more susceptible to genital infections and it can be transmitted through an intact hymen also. Moreover, most women have a slight exit for the menstrual blood loss through the hymen and if there is any imperforate hymen then it is a medical condition which needs treatment.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For an exact diagnosis, you are advised to consult your doctor. I sincerely hope that helps. Take care.
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