👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Basic Care & Comfort🔖 Free to read, print, and share
Also known as: mastitis · breast infection · lactation mastitis · inflamed breast
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Use this quick-reference guide to spot, treat, and prevent Mastitis on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Mech
Milk stasis + S. aureus infection
Usually unilateral, lactating mom
🩺 Signs
Red warm tender wedge-shaped area
Fever, chills, flu-like, malaise
✅ Do
KEEP breastfeeding/pump → empty breast
Warm compress before, cold after
Antibiotics (dicloxacillin), rest, fluids
🎓 Teach
Milk is safe for baby
Don't stop nursing → worsens stasis
Abscess/no improvement → report
📚 Mastitis — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Mastitis is inflammation and usually infection of breast tissue, most common in breastfeeding women during the early postpartum weeks. It typically results from milk stasis and bacterial entry (often Staphylococcus aureus) through a cracked nipple. The hallmark is a localized, red, warm, tender, often wedge-shaped area on one breast accompanied by flu-like symptoms.
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Key points
Understand these first
Usually unilateral with a hard, red, warm, painful area and systemic flu-like symptoms (fever, chills, malaise, body aches).
Milk stasis from infrequent emptying, plugged ducts, or cracked nipples predisposes to infection.
Continuing to breastfeed or pump is encouraged because keeping the breast emptied promotes healing.
Treatment is a full course of antibiotics (e.g., dicloxacillin or cephalexin), analgesics, rest, and fluids.
Warm compresses before feeding aid milk flow; cool compresses after feeding reduce pain and swelling.
An untreated or worsening infection can progress to a breast abscess requiring drainage.
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Nursing priorities
What to do, in order
Encourage frequent, complete breast emptying by continued nursing/pumping, starting on the affected side.
Administer the full prescribed antibiotic course and analgesics; teach completing all antibiotics.
Apply warm compresses before feeding and cool compresses afterward, and promote rest and fluids.
Assess and teach correct latch and breast care to prevent recurrence.
Monitor for a localized fluctuant mass suggesting abscess.
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Red flags — report now
Escalate immediately
Report a fluctuant, increasingly painful mass (possible abscess needing drainage).
Report high or persistent fever or worsening symptoms despite 48-72 hours of antibiotics.
Never advise stopping breastfeeding on the affected side; abrupt weaning worsens stasis.
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Labs & values
Numbers to know
WBC may be elevated with infection (normal ~5,000-10,000/mm3)
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Patient teaching
What patients must know
Keep breastfeeding or pumping frequently; emptying the breast helps it heal and the milk is safe for the baby.
Complete the entire antibiotic course even after feeling better.
Prevent recurrence with proper latch, frequent feeding, varied positions, and prompt care of cracked nipples; rest and increase fluids.
❓ Mastitis: NCLEX FAQs
What are the priority nursing interventions for Mastitis?
Encourage frequent, complete breast emptying by continued nursing/pumping, starting on the affected side. Administer the full prescribed antibiotic course and analgesics; teach completing all antibiotics. Apply warm compresses before feeding and cool compresses afterward, and promote rest and fluids. Assess and teach correct latch and breast care to prevent recurrence.
What are the warning signs of Mastitis a nurse must report?
Report a fluctuant, increasingly painful mass (possible abscess needing drainage). Report high or persistent fever or worsening symptoms despite 48-72 hours of antibiotics. Never advise stopping breastfeeding on the affected side; abrupt weaning worsens stasis.
What do I need to know about Mastitis for the NCLEX?
Usually unilateral with a hard, red, warm, painful area and systemic flu-like symptoms (fever, chills, malaise, body aches). Milk stasis from infrequent emptying, plugged ducts, or cracked nipples predisposes to infection. Continuing to breastfeed or pump is encouraged because keeping the breast emptied promotes healing. Treatment is a full course of antibiotics (e.g., dicloxacillin or cephalexin), analgesics, rest, and fluids.
What patient teaching is important for Mastitis?
Keep breastfeeding or pumping frequently; emptying the breast helps it heal and the milk is safe for the baby. Complete the entire antibiotic course even after feeling better. Prevent recurrence with proper latch, frequent feeding, varied positions, and prompt care of cracked nipples; rest and increase fluids.
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Quick Tip
Usually unilateral with a hard, red, warm, painful area and systemic flu-like symptoms (fever, chills, malaise, body aches).