There can be many causes that aren't serious when it comes to breast pain. If your breast pain is accompanyed by: swelling, firmness, and pain to the touch or while moving around then these three things might be the cause. If you're near your period, or sometimes during ovulation they can get tender and sore to the touch. If you're taking hormonal birthcontrol this can be a symptom. And if youre growing it can cause tenderness. If you don't suspect any of those, or you've had a recent injury to the breasts please consult your doctor.