Jen, except in very rare cases, pain isn't a sign of breast cancer. If the pain goes across your whole breast; and your breast becomes hot and swollen, turns red, and maybe starts to itch, like an infection, it might be inflammatory breast cancer. But a slight, burning pain is probably a nerve thing, or even something hormonal. If it doesn't go away or gets worse, why not make a doctor's appointment, just to set your mind at ease? Good luck. - PJH