Mastitis is when your breast becomes swollen, hot and painful.
It's most common in breastfeeding women, but women who are not breastfeeding and men can also get it.
Mastitis usually only affects 1 breast, and symptoms often come on quickly. They include:
You may also get flu-like symptoms, such as aches, a high temperature, chills and tiredness.
soak a cloth in warm water and place it on your breast to help relieve the pain – a warm shower or bath may also help
rest and drink lots of fluids
take paracetamol or ibuprofen to reduce any pain or fever
if you are breastfeeding, continue to breastfeed
start feeds with the sore breast first
express milk from your breast in between feeds
massage your breast to clear any blockages – stroke from the lumpy or sore area towards your nipple to help the milk flow
do not wear tight-fitting clothing or bras until you feel better
do not take aspirin
A GP will usually prescribe antibiotics.
If you're breastfeeding a very small amount of the antibiotic may go into your breast milk. There is no risk to your baby, but it might make them irritable and restless.
If you are breastfeeding and keep getting mastitis, it might be due to problems with positioning and attaching.
If you have any breastfeeding problems, it's important to ask for help from a midwife, health visitor or a breastfeeding specialist as soon as possible.
You can also call the National Breastfeeding Helpline on 0300 100 0212 (9.30am to 9.30pm, daily)
Mastitis is common in breastfeeding women as it can be caused by a build-up of milk.
Women who are not breastfeeding can also get mastitis, as can men. This can happen due to: