Since this is just one breast, it's more concerning than if it were both - in which case I'd say it's probably hormonal. Please read our post on breast pain, and see if your symptoms match anything described there. Luckily, breast pain is - well, a pain - but usually nothing serious. However, a rare type of breast cancer, inflammatory breast cancer, can start with pain. Please read our post on IBC symptoms; and if you think you might be experiencing early signs, best to see a doctor sooner rather than later, just to rule it out. Hope this resolves on its own soon - PJH
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