I don't know why this is happening all of a sudden and I wasn't sure where to post this question, but lately after pumping the side of my breast starts hurting. I'm using a new pump and it's really easy and comfy to use, so I wonder if it's caused by my pump or something else....I haven't gotten my period yet but maybe I'm PMS'ing. It's not really an ache though, more of a sharp pain. Any help would be greatly appreciated!!