An untreated blocked duct or mastitis can result in a breast abscess. You may feel feverish, and you may have a shiny red patch on your breast that is exquisitely tender. Your doctor should prescribe antibiotics; if this fails, the abscess will have to be drained surgically, but you may be able to continue breastfeeding even if you need this minor operation – ask your doctor’s advice.

If a blocked duct is not treated, it can lead to an acute infection, known as mastitis. The breast will be inflamed and a red patch will appear on the outside, as with a blocked duct. If you can, you should continue to breastfeed because you need to empty the breast. However, you may find nursing too painful. In any case, consult your doctor, who may prescribe antibiotics.

Tight clothing or engorgement can cause a blocked milk duct, resulting in a hard red patch on the outside of the breast. You can prevent this by encouraging your baby to feed often and empty your breasts, and by making sure your bra fits properly. If you do get a blocked duct, offer the affected breast first.

Toward the end of the first week, before breastfeeding has become fully established, your breasts may become overfull and painful and quite hard to the touch. If this happens, your baby won’t be able to latch on successfully. Make sure you wear a good bra to minimize discomfort, and gently express some milk before feeding to relieve the fullness. Having warm baths will also help relieve the discomfort by promoting milk flow.