im 23 and been suffering from really sore nipples, they seem to hurt whenever i knock them or if i were to push my nipple inwards both are equally as sore but my left breast seems to be getting a sharp pain when i breath!! i always seem to have tender breasts ever since i can rememeber. i check them for lumps but havent noticed a change. over the past month i have noticed my nipples have become darker around the outside, i recently thought i was pregnant but took 3 pregnancy tests and they each came back negative!..i dont know whether i need to visit my doctor as i dont know if its anything serious. im also on the pill but have taken a month break from it and dont know if this is the cause.