Blocked ducts

In your breast, milk flows through ducts to a number of tiny openings on the nipple. Sometimes these ducts can become blocked, milk builds up behind the blockage and you get a lump. 

You may notice: 

• An area of your breast is lumpy or swollen.   

• It may look red and feel tender. 

• It may be painful especially when your let-down reflex happens. 

Having a blocked duct is different from general engorgement.

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Blocked ducts can happen at any time during breastfeeding.  

• Going longer between feeds.  

• If your baby sleeps for longer or sleeps overnight. 

• If feeds are rushed or baby doesn't drain your breast fully.  

• Some mums who make too much milk are more likely to get blocked ducts. 

• Due to injury, bruising or external pressure on the breast, eg tight bra, seatbelt, sleeping on stomach. 

Start treatment as soon as you feel a lump or sore spot. Taking the following steps may prevent the blocked duct from progressing to mastitis.  

When feeding: 

• Feed as often as you can. 

• Feed from the affected breast first, when baby's sucking is stronger. 

• Check that your baby is attached well 

• Try different feeding positions to help empty the breast. 

• Gently massage the lump toward the nipple during feeds. 

Before feeding: 

• Apply warmth to the affected breast before a feed to help your let-down reflex and encourage your milk to flow. 

• Try to relax to help your milk flow.  

• Make your breasts as comfortable as possible by taking off or loosening your bra during feeds. 

After feeding: 

• Hand express after feeds if needed. 

• Cold packs after a feed may help relieve pain and inflammation. 

See your doctor if you cannot clear the lump in a few days, or sooner if you develop a fever or feel unwell. Mastitis can result from a blocked duct that doesn’t clear.

• Feed your baby often. 

• Wear comfortable clothing so there is no pressure on your breasts. 

• Rest when you can, eat well and drink enough water. 

© Australian Breastfeeding Association April 2022