Mastitis while breastfeeding: symptoms and when to call

Mastitis is breast inflammation that can appear during breastfeeding, often after engorgement or a blocked duct. It can make you feel very unwell, like flu, and it should be taken seriously.

This guide does not replace medical care. It helps you recognize signs and avoid losing time.

Possible symptoms

Mastitis may cause:

• a hot, hard and painful area of the breast;
• redness or skin color change;
• swelling;
• chills;
• fever;
• intense tiredness;
• pain during or between feeds.

On darker skin, redness may be less obvious. Local pain, warmth and feeling generally ill still matter.

What to do in the first hours

While waiting for professional advice, if you can:

• continue breastfeeding or express gently;
• check latch and position;
• do not let the other breast become too full;
• rest as much as possible;
• use cold between feeds for pain and swelling;
• use breastfeeding-compatible pain relief only as advised;
• drink according to thirst.

NHS notes that continuing to breastfeed can be important. If pain prevents feeding, ask quickly for help with hand expression or pumping.

What to avoid

Avoid:

• stopping breastfeeding abruptly;
• forcefully massaging a painful area;
• pumping large amounts to "empty everything" without advice;
• using intense heat for long periods;
• waiting days if you have fever or feel ill;
• starting leftover or unprescribed antibiotics.

If there are cracked nipples, they should be assessed because they can contribute to pain, ineffective latch and infection risk.

Is the milk safe?

In many cases, breast milk can still be offered. The decision depends on the clinical situation, medicines and medical advice. If you are prescribed treatment, ask specifically how to manage feeds, expressed milk and the affected breast.

When it is urgent

Contact a doctor quickly if:

• fever and chills are significant;
• you feel very unwell;
• pain is getting worse;
• a very painful or soft lump appears;
• redness or color change spreads;
• your baby feeds less;
• symptoms do not improve within 12-24 hours.

If your baby has fewer wet diapers or refuses milk, also use the thresholds in when to call the pediatrician.

After mastitis

After the acute phase, look for the trigger: latch, missed feeds, tight bra, oversupply, pump fit, exhaustion or cracked nipples. The breastfeeding support checklist can help prepare a focused consultation.

Key takeaway

Mastitis is not discomfort to push through. Early action helps protect maternal health, breastfeeding continuity and baby's intake.

Useful links

• Breast engorgement
• Cracked nipples while breastfeeding
• Expressing and storing breast milk
• When to call the pediatrician
• Breastfeeding support checklist