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"Why do my nipples hurt before my period is due?A week before your monthly flow shows up, your body boosts production of progesterone, which causes breast tissue to feel tender. It's often noticed in the middle and upper parts of each boob, but lots of women also feel sore around their nipples. Pop ibuprofen to quell the pain, and cut back on caffeine, which will also help out."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cosmopolitan.com/sex-love/advice/a474/nipples-hurt-before-period/>