Christina, this doesn't sound like a breast cancer symptom; pain seldom is, and then, it's usually more soreness than sharp pain. But since the pain is on your left side, you'll want to consider/rule out a cardiac issue. In the meantime, please read our post on breast pain; hopefully you'll find some information there that'll help clarify what might be causing this pain. Hope it diesappears on its own soon- PJH
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