The actual pain of the breast is as painful as a pinprick, there are several possibilities: 1, physiological, the breast began to lactation, discharge, the breast will have a little stabbing pain, slowly will be relieved by itself. 2, breast chap, the breast will radiate to the root, resulting in a pinprick pain sensation in the breast, this pain is more intense. The most important thing for mastitis is that the milk is emptied as much as possible and not blocked, leading to inflammation and hard knots.