Mastitis Symptoms and What to Do Right Now
Brandi O'Neal
RN, BSN, IBCLC
If you're reading this at 3 AM with a painful, red breast and a fever, take a breath. Let's figure out what's going on and what to do about it.
What Is Mastitis?
Mastitis is inflammation of the breast tissue that sometimes involves an infection. It usually occurs in the first 6 weeks of breastfeeding but can happen at any time.
Symptoms to Watch For
Early signs (act now):
- A painful, warm area on one breast
- Redness in a wedge or streak pattern
- A hard lump that doesn't resolve with feeding
- Breast feels "full" even after nursing
Signs it may be progressing:
- Fever (100.4°F / 38°C or higher)
- Body aches and chills (feels like the flu)
- Fatigue beyond normal new-parent tired
- Continued redness and warmth that spreads
Call your provider today if: You have a fever above 101°F, your symptoms have not improved after 12–24 hours of home care, you see pus or blood in your milk, or you feel significantly worse rather than better.
What to Do Right Now
1. Keep Nursing or Pumping
This is the most important thing. Do not stop breastfeeding from the affected side. Frequent, effective milk removal is the primary treatment.
2. Apply Warmth Before Feeds
A warm compress or standing in a warm shower before nursing can help with letdown and milk flow from the affected area.
3. Cool Compress After Feeds
After nursing, apply a cool compress or cold cabbage leaf to reduce inflammation and pain.
4. Rest
Mastitis is your body telling you to slow down. Rest is not optional — it's treatment. Ask for help. Cancel plans. Stay in bed if you can.
5. Anti-Inflammatory Pain Relief
Ibuprofen (Advil) is safe while breastfeeding and helps with both pain and inflammation. Follow package dosing instructions.
When You Need Antibiotics
If home care doesn't improve symptoms within 12–24 hours, or if you develop a high fever, your provider will likely prescribe antibiotics. This is appropriate and does not mean you need to stop breastfeeding.
Preventing Recurrence
- Nurse frequently and on demand
- Ensure a good latch (poor latch = incomplete emptying)
- Avoid tight bras or clothing that compress breast tissue
- Don't skip feeds or go long stretches between pumping sessions
- Gradually wean if that's your plan — don't stop suddenly
Brandi O'Neal
Brandi O'Neal, RN, BSN, IBCLC
Board-certified lactation consultant, registered nurse, and mother of three. 7+ years of clinical lactation experience supporting thousands of families through their feeding journeys.