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.

Check if you have mastitis

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.

Things you can do


  • 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

Non-urgent advice: See a GP if:

  • you do not feel better within 24 hours despite continuing to breastfeed
  • you get mastitis and you are not breastfeeding
  • your symptoms do not get any better 48 hours after taking antibiotics

Treatment for mastitis from a GP

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.

What to do if mastitis comes back

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)

Causes of mastitis

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:

Page last reviewed: 29 October 2019
Next review due: 29 October 2022