Jessica, pain isn't usually a symptom of breast cancer. But pay attention to that knot you feel; if it's still there within a few weeks, it qualifies as a breast change, and all breast changes should be checked out by a doctor. In the meantime, please read our posts on breast pain and breast lumps for more information about what might be causing this. Since it's on your left side, you might also want to rule out a heart issue. Take care- PJH
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