it could be. try to unblock the duct by
- massaging in circular motion in the area of the pain before pumping, then pushing your breast towards the aureola like you r trying to push the milk out of your breast
- place a hot towel on it for five min before pumping
- have a hot shower and let how water run over that area (but cover your aureola), then quickly pump
- drink hot drink or hot soup before quickly pumping.