Hi - This could be a hormonal issue, or a nerve issue. Unless the pain is accompanied by other symptoms - for instance, if your breast seems infected (red, hot, swollen, itchy); or if you have a fever, it doesn't sound like a cancer symptom.
Please read our post on breast pain, and our post on nipple issues. I think those will help you decide whether/when to see a doctor about this pain. Good luck - PJH
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