Left Breast And Nipple Pain What Is Causing This Breast And Nipple Pain?

What is causing this breast and nipple pain? - left breast and nipple pain

I have pain in my left breast and the nipple is very sensitive. The nipple hurts when touched or pressed. No download. My right breast hurts the same way too, but not both. I had my period a week ago. My breasts are tender the week As a rule, before my time, but I am not expired and that the pain is much greater than the pain before my time. I also noticed that my breasts are very veins. As far as I know, I am not pregnant.