Left Shoulder Pain Breast Cancer Pain In Left Breast?????

Pain in left breast????? - left shoulder pain breast cancer

IM 20 now, but since I am 18, I had little pain in my left breast after my daughter had the worst pain I thought a lil, it could breastfeed because I was, but now that I am not breastfeeding and I do not know and it still does hurt ..... now also get pain in the arm and shoulder, but especially on the left side of the left breast ...... This could be ..... the song is breast cancer?