A hard lump in the breast and painful to touch during breastfeeding can occur in the early stage of breastfeeding, when the pregnant woman has sufficient milk and the newborn baby has a small appetite and little sucking ability, causing the milk in the breast to stagnate in the breast, and if it is long, the breast will become blocked, causing a hard lump in the breast that is painful and swollen. If this happens, you need to apply hot towels to your breasts to smooth out the blood circulation and relieve the blockage, or you can use a breast pump to suck out the stagnant milk and empty your breasts. The breast pump must be used properly, and the total time for sucking should not exceed 30 minutes for both breasts, otherwise it will damage the nipple and cause inflammation of the breast, resulting in redness, swelling and pain in the breast, at which point breastfeeding should be stopped. Go to the hospital as soon as possible for an ultrasound and, if necessary, a mammogram to determine the pathogen for effective treatment.