Tender Breasts Causes More Condition_symptoms What Causes Swollen And Tender Breasts?!?

What causes swollen and tender breasts?!? - tender breasts causes more condition_symptoms

During PMS, there is usually a little tender and swollen breasts, but are larger than normal this month, so I do not even wear a bra that is two sizes larger than my normal size cups! What are the causes of this, if nobody knows PMS?