breast/back pain

Hi, Im an 18 year old female.
For almost a week now, ive been experiencing pain in my left breast, and left side/back. It seems to hurt even more when im wearing a bra, or when im putting pressure on my chest.
This has never happened to me  before, and i was wondering if anyone could help me? Im not sure what this pain is relating to? I dont know if its breast cancer? or maybe i just need to change my bra size?
please help!

thanks!

-Leah

[japdip]

First of all pain is rarely if ever associated with breast cancer and there are many reasons for breast pain and since you state that this pain is also involving your side ande back it could very well be some muscular strain. If this worries you and continues I would suggest that you make an appointment with your Dr. for an examination.  I don't see any realation to breast cancer though.    Regards ....