What causes painfull breasts during menstrual periods?!
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It is also common to have sore breasts around the beginning of a girl's period, or menstruation. A week or so before her period starts, the body begins producing lots of the female hormones estrogen and progesterone.
These hormones can cause feelings that together are called premenstrual syndrome, or PMS. Some girls have painful cramps in their stomachs, headaches, mood swings, or cravings for certain foods right before their periods begin. During this time the body may retain water, which can make a girl feel puffy and bloated. Rings and shoes may feel tight at this time.
Just as fingers and feet swell, so can breasts. All that fluid forces the breast tissues to expand, which stretches the nerves and makes breasts feel achy or tender.
http://kidshealth.org/teen/sexual_health/girls/sore_breasts.html
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RAGING HORMONES
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