The short explanation
A hard, red, painful area with fever and body aches can be mastitis, an inflammation of the breast that sometimes becomes infected. In most cases you can and should keep breastfeeding or expressing from that side. Emptying the breast helps it settle, and the milk is generally fine for the baby. Because you have fever, it is sensible to see a doctor the same day. A clinician may suggest treatment if an infection is likely.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Rest, fluids, feeding often and starting feeds on the affected side if comfortable can help. Gentle massage towards the nipple and cold or warm compresses are sometimes used.
- Mastitis can start from a blocked duct, a poor latch, missed feeds, or tight clothing.
- If a painful lump stays after treatment, a doctor may check for an abscess, which may need draining.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot tell whether you have an infection or an abscess. An examination and sometimes an ultrasound are needed.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Is this mastitis, and does it need treatment?
- Is the treatment suitable while breastfeeding?
- Should I have an ultrasound to rule out an abscess?
- How can I prevent this happening again?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Emergency — call 112 now
- Call 112 or go to the nearest emergency department if you have a high fever with shivering, feel confused, very drowsy or breathless, or feel extremely unwell.
- Call 112 also if red streaks spread quickly across the breast or you feel faint.
Get help the same day
- See a doctor today because you have fever with a red, painful breast.
Book an appointment soon
- Go back within a few days if you are not clearly better, or if a lump remains.
Raise it at a routine appointment
- Ask for latch support at a routine visit to reduce the chance of it returning.
Sources
The evidence this explanation is built on.
- Mastitis NHS
- Breastfeeding MedlinePlus (NIH)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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