Postpartum breast pain and swelling

Postpartum breast pain and swelling is discomfort, tenderness, fullness, redness or a lump in one or both breasts after birth, usually related to lactation. Most causes are benign and linked to milk flow (engorgement, blocked duct, nipple trauma, mastitis), but mastitis can progress to abscess and sepsis, and persistent lumps or skin changes need assessment for rarer causes including breast cancer.

The main clinical points are:

• examine the breast and nipple and observe a breastfeed
• separate non infective from infective inflammation
• continue milk removal rather than stop breastfeeding
• give analgesia and antibiotics only when indicated
• identify abscess
• follow up any persistent mass

Clinical relevance. Breast problems are a leading reason for early cessation of breastfeeding. Mastitis affects about 1 in 10 lactating women, most in the first 6 weeks. Untreated mastitis can cause abscess, recurrent infection and early weaning.

Physiology. Colostrum is present from late pregnancy; copious milk production begins 2 to 5 days after birth (lactogenesis II) as progesterone falls, with breast fullness, warmth and heaviness. Milk removal is the main driver of supply. Prolactin rises with suckling; oxytocin causes the let down reflex. Nipple pain is common in the first week and should settle.

Mechanisms. Engorgement: vascular and lymphatic congestion with milk accumulation. Blocked duct: local milk stasis. Mastitis: inflammation from milk stasis, with or without bacterial infection (Staphylococcus aureus, coagulase negative staphylococci, streptococci) entering through nipple damage. Abscess: localised collection. Nipple trauma: poor latch or tongue tie. Vasospasm: nipple blanching. Candidiasis: yeast overgrowth after antibiotics.

Classification. By cause: physiological (engorgement), lactation related (blocked duct, mastitis, abscess, galactocele, oversupply), nipple conditions (trauma, candidiasis, vasospasm, dermatitis), non lactational (breast cancer, fibroadenoma, Paget disease, duct ectasia), and non breast (musculoskeletal, cardiac, pleural, herpes zoster). By timing: early (days 3 to 7, engorgement), subacute (week 2 to 6, mastitis, blocked duct), late (after weaning or months, abscess, galactocele).

Key distinctions. Bilateral fullness and tenderness at day 3 to 5 favours engorgement. A tender wedge shaped area with redness, heat, fever and flu like illness in one breast favours mastitis. A fluctuant tender mass with persistent fever despite antibiotics favours abscess. Burning nipple pain radiating into the breast during and after feeds with pink shiny nipples favours candidiasis.

Colour change of the nipple (white, blue, red) after a feed suggests vasospasm. A hard, fixed, painless lump, skin dimpling or peau d'orange, nipple retraction or bloody discharge outside lactation needs urgent assessment.

History

• Timing since birth; unilateral or bilateral; pain pattern (during feeds, between feeds, constant, burning, stabbing), swelling, lumps, redness, warmth, fever, flu like symptoms, nipple pain, cracks, bleeding, discharge.
• Breastfeeding: frequency, duration of feeds, latch, positions, pump use, supplements, dummy or bottle use, sudden change (missed feeds, longer gaps), baby's weight gain and wet nappies, oral thrush in the baby, tongue tie, baby's sucking.
• Risk factors for mastitis: nipple damage, previous mastitis, missed feeds, oversupply, tight bra or sling, stress and fatigue, baby with poor suck, abrupt weaning, diabetes, immunosuppression, HIV.
• Medical: previous breast surgery or implants, breast lumps, family history of breast cancer, hyperprolactinaemia, thyroid disease, eczema, psoriasis, diabetes.
• Drugs: antibiotics (candidiasis), hormonal drugs, domperidone, ergot derivatives, decongestants (vasoconstriction), nicotine and caffeine (vasospasm).
• Associated: wound pain, vaginal bleeding, calf pain, breathlessness, chest pain, rash along a dermatome (herpes zoster).
• Social and psychological: support, sleep, mood, intention to breastfeed or suppress lactation.

Examination

• Vital signs: temperature, pulse, blood pressure, respiratory rate.
• Breast inspection (both breasts, arms raised and lowered): symmetry, erythema (location, shape, margins), swelling, skin dimpling, peau d'orange, venous pattern, nipple position, cracks, blisters, scale, discharge.
• Palpation: warmth, tenderness, firmness, lumps (size, mobility, fluctuation), axillary and supraclavicular nodes.
• Nipple: cracks, fissures, colour (blanching), shape after feed (wedge shaped or lipstick shaped suggests poor latch), white blebs (milk blister), candida signs, eczema.
• Observe a breastfeed: position, latch, swallowing, nipple shape after, milk flow; examine the baby's mouth (tongue tie, palate, thrush).
• Chest wall, ribs, lungs and heart if pain is not clearly breast.
• Wound, uterus, perineum, calves.

Red flags

• Fever of 38.5°C or more, rigors, heart rate over 100 beats/min, hypotension, or confusion (sepsis).
• A fluctuant, tender, warm mass, or a lump persisting after treatment of mastitis (abscess).
• Rapidly spreading redness, skin necrosis, blistering, crepitus (necrotising infection).
• A hard, fixed, painless lump, skin dimpling, peau d'orange, nipple inversion or retraction, or bloody nipple discharge.
• Persistent unilateral redness and swelling with no fever that does not respond to antibiotics (inflammatory breast cancer).
• Symptoms in one breast only that fail to improve after 48 to 72 hours of treatment.
• Calf swelling, chest pain, breathlessness (pulmonary embolism).
• Breast or chest discomfort with hypertension, headache or visual symptoms (pre eclampsia can present after birth).
• Poor weight gain, dehydration or jaundice in the baby.
• HIV infection with nipple bleeding or abscess (higher risk of transmission to the baby).

Special groups.

• Women with HIV on effective antiretroviral therapy should be supported to breastfeed with careful monitoring; severe mastitis, nipple bleeding or abscess increase transmission risk and need prompt treatment.
• Women with diabetes are prone to candidiasis and abscess.
• Women with breast implants or surgery have altered milk flow.
• Women with previous breast surgery may have low supply.
• Region specific: late presentation with abscess, traditional practices (breast massage, hot compresses) that worsen inflammation, and unavailable lactation support.

Organised by cause. Each cause is common unless marked serious or uncommon.

Physiological and milk flow disorders

• Breast engorgement (days 3 to 5, bilateral).
• Blocked (plugged) duct: tender wedge shaped lump without systemic features.
• Milk blister (bleb) at a nipple pore.
• Oversupply, forceful let down.
• Non infective (inflammatory) mastitis.
• Late weaning, sudden weaning, or missed feeds.
• Galactocele (milk filled cyst).
• Breast pain with oxytocin or prolactin related let down.

Infection

• Infective lactational mastitis (Staphylococcus aureus most commonly).
• Serious: breast abscess.
• Serious: necrotising infection (rare).
• Nipple candidiasis (burning, shiny pink nipple) and ductal candidiasis (disputed).
• Tuberculous mastitis, granulomatous mastitis (idiopathic or infective).
• Herpes simplex or zoster of the nipple and chest wall.
• Impetigo of the nipple.
• Infected skin lesions: eczema, folliculitis, hidradenitis.

Nipple conditions

• Nipple trauma and cracks (poor latch, tongue tie, pump flange).
• Nipple vasospasm and Raynaud phenomenon.
• Eczema, contact dermatitis (creams, lanolin), psoriasis.
• Paget disease of the nipple (rare).

Neoplasms

• Serious: breast cancer (pregnancy associated, including inflammatory carcinoma).
• Fibroadenoma, lactating adenoma, phyllodes tumour.
• Intraductal papilloma (bloody discharge).
• Lymphoma, leukaemic infiltration (rare).
• Lipoma, haemangioma.

Hormonal and systemic

• Prolactinoma, hyperprolactinaemia.
• Hypothyroidism and hyperthyroidism.
• Postpartum thyroiditis.
• Pre eclampsia with swelling.
• Fluid overload and oedema (cardiac, renal, drug related).
• Peripartum cardiomyopathy with chest discomfort.

Non breast

• Costochondritis, rib fracture, muscle strain from feeding posture.
• Pleurisy, pneumonia, pulmonary embolism.
• Cardiac pain, oesophageal reflux.
• Cervical spine disease.
• Referred pain from gallbladder or diaphragm.
• Axillary lymphadenitis (vaccine reaction, infection).
• Mondor disease (thrombophlebitis of the breast veins).

Stepwise reasoning

1. Decide whether the problem is bilateral and physiological (engorgement) or unilateral and focal (blocked duct, mastitis, abscess, mass).
2. Look for sepsis and for signs of abscess.
3. Observe a feed and assess latch, tongue tie and oral thrush.
4. Treat milk stasis first; use antibiotics for infective mastitis, abscess or systemic illness.
5. Image and biopsy any lump that persists beyond 2 weeks of treatment or looks suspicious.

First line tests

• Clinical diagnosis for engorgement, blocked duct and mastitis; no tests are needed for mild cases.
• Temperature and observations; full blood count and C reactive protein when systemically unwell.
• Milk culture (midstream sample after cleaning the nipple) when mastitis is severe, hospital acquired, recurrent, not responding in 48 hours, or when resistant organisms are suspected; routine culture is not required.
• Blood cultures if septic.
• Swab of a nipple lesion for bacteria, herpes or candida.
• Capillary glucose in women with diabetes.

Targeted tests

• Breast ultrasound for any palpable lump, suspected abscess, or lack of response to treatment: abscess shows a hypoechoic, thick walled collection; a galactocele shows an anechoic or fat fluid cyst. Ultrasound is safe in lactation and is the first imaging test.
• Needle aspiration under ultrasound, with culture for abscess; core biopsy for any solid lump, persistent mass, skin change, or doubtful diagnosis, with a request to the pathologist stating that the woman is lactating.
• Diagnostic mammography with ultrasound, for suspicious lumps in women over 30 or with strong risk.
• MRI for complex cases.
• Thyroid function tests and prolactin only if galactorrhoea beyond expected lactation or other features suggest endocrine disease.
• Tuberculosis testing (sputum, biopsy, culture) in endemic regions for chronic granulomatous mastitis.
• Candida: diagnosis is clinical (burning pain with pink shiny nipple and infant thrush); swab if doubtful.
• Test the baby for tongue tie and assess weight gain.

Limitations. Culture is not needed for typical mastitis and adds delay. Erythema is more difficult to detect on dark skin, so rely on warmth, firmness and pain. Ultrasound after drainage may show residual change. Breast cancer is rare in the postpartum woman but is often diagnosed late because swelling is attributed to lactation; any mass persisting more than 2 weeks warrants imaging.

Immediate steps. Assess for sepsis. Provide analgesia. Show the woman how to continue milk removal: breastfeed or express every 2 to 3 hours (8 to 12 times in 24 hours), starting on the less painful breast if let down is difficult, without over expressing. Admit for sepsis, abscess needing drainage, or inability to cope.

Breast engorgement

• Frequent feeds (8 to 12 in 24 hours) beginning within the first hour after birth, effective latch, and feeding on demand.
• Before a feed: warm shower or warm compress for a few minutes, gentle massage towards the nipple, hand expression or reverse pressure softening (pressing around the areola for 1 to 2 minutes) to soften the nipple area so the baby can latch.
• After a feed: cold packs or cold cabbage leaves for 15 to 20 minutes; supportive well fitting bra (not tight, no underwire).
• Analgesia: paracetamol 1 g orally every 4 to 6 hours (maximum 4 g daily; 3 g daily with alcohol use, malnutrition or liver impairment); ibuprofen 400 mg orally every 6 to 8 hours with food (maximum 1.2 g daily without supervision, up to 2.4 g daily for a short course), acceptable during breastfeeding.
• Avoid prolonged pumping that increases supply. Engorgement resolves within 24 to 48 hours with effective milk removal. Review if fever or hard areas develop.

Blocked duct

• Feed or express frequently, starting with the affected breast if tolerable, positioning the baby with the chin pointing to the blockage; gentle massage towards the nipple (not deep or vigorous, which can worsen inflammation); warmth before feeds; cold after.
• Ibuprofen 400 mg every 6 to 8 hours; paracetamol 1 g every 4 to 6 hours.
• Milk blister: after warm compress and feeding, gently open with a sterile needle if it persists, and apply a topical antibiotic or emollient; ultrasound assessment and treatment for recurrent blocked ducts.
• Lecithin 1200 mg orally three to four times daily has been used for recurrent blocked ducts (evidence limited). Reduce oversupply, avoid pressure from bras and straps.

Mastitis

• Continue breastfeeding or expressing; do not stop. Ensure good latch and positioning; empty the affected breast; avoid vigorous massage; rest, fluids and analgesia (ibuprofen 400 mg every 6 to 8 hours, paracetamol 1 g every 4 to 6 hours).
• Non infective mastitis: 12 to 24 hours of effective milk removal, cold packs and analgesia; reassess.
• Antibiotics if symptoms are severe, nipple damage is present, symptoms last more than 12 to 24 hours despite milk removal, or the woman is systemically unwell: flucloxacillin 500 mg to 1 g orally every 6 hours for 10 to 14 days.
• For penicillin allergy: cefalexin 500 mg orally every 6 hours or clindamycin 300 to 450 mg orally every 8 hours. Co-amoxiclav 625 mg every 8 hours is a second option.
• For sepsis: intravenous flucloxacillin 1 to 2 g every 6 hours (or cefazolin 2 g every 8 hours). Add vancomycin when methicillin resistant Staphylococcus aureus is likely.
• Review at 48 hours. If no improvement, obtain culture and ultrasound for abscess; adjust antibiotics.
• Recurrent mastitis: treat promptly for 14 days, correct latch and oversupply, evaluate for tongue tie and nipple candidiasis, consider probiotic Lactobacillus fermentum or Lactobacillus salivarius (evidence limited), culture the milk, and refer for ultrasound to exclude underlying lesions.

Breast abscess

• Needle aspiration under ultrasound (repeated every 1 to 3 days) with antibiotics is the first choice for abscesses under 3 cm (or up to 5 cm in selected cases), under local anaesthetic (lidocaine 1% up to 3 mg/kg, without adrenaline near the nipple).
• Incision and drainage for large abscesses (over 5 cm), skin necrosis, failed aspiration, or multiloculated collections; place the incision away from the areola, pack lightly, and review in 24 hours.
• Antibiotics for 10 to 14 days (flucloxacillin 500 mg to 1 g every 6 hours, or, in penicillin allergy, cefalexin or clindamycin) with culture of the pus.
• Breastfeeding can continue from the affected side if the incision is away from the areola and the baby can latch; otherwise express and discard until healing.
• Admit for sepsis, large abscess, or poor home support. Biopsy a persisting mass or irregular cavity after treatment.

Nipple trauma and pain

• Correct latch and positioning, break suction before removing the baby, treat tongue tie (frenotomy for functional tongue tie causing poor feeding or pain).
• Apply expressed milk, pure medical grade lanolin or hydrogel dressings after feeds; avoid soap and alcohol on nipples.
• Paracetamol 1 g every 4 to 6 hours; ibuprofen 400 mg every 6 to 8 hours.
• For severe fissures, rest the breast for 24 to 48 hours with expression; topical antibiotic (mupirocin 2% ointment twice daily for 7 days) for infected fissures; nipple shields only as a short term aid with lactation support.
• Dermatitis: moderate potency topical steroid (hydrocortisone 1% to betamethasone valerate 0.025% cream) thinly for 7 days, wiped off before feeds.

Nipple candidiasis

• Miconazole 2% cream applied thinly to the nipple after feeds for 7 to 14 days.
• Add miconazole oral gel 2% (0.5 mL in the baby's mouth four times daily for 14 days, applied after feeds) or nystatin 100,000 units/mL suspension 1 mL four times daily to the baby's mouth for 7 to 14 days.
• Fluconazole 150 mg orally once, then 100 mg orally once daily for 10 to 14 days, may be given for deep breast pain with strong features of ductal candidiasis (evidence limited; compatible with breastfeeding).
• Treat both mother and baby at the same time; wash pump parts and clothing; replace nipple pads and dummies.

Nipple vasospasm

• Keep the breast warm after feeds, avoid cold exposure, stop smoking, and reduce caffeine.
• Nifedipine modified release 30 mg orally once daily for 14 days (stop if no improvement; maximum 60 mg daily), with monitoring for headache and hypotension. Avoid in pre eclampsia treated with magnesium.
• Review for correct latch (vasospasm often follows trauma).

Galactocele. Aspirate under ultrasound for symptoms; usually resolves with weaning; infection is treated as an abscess.

Lactation suppression (for stillbirth, neonatal loss, medical reasons or maternal choice)

• Cabergoline 1 mg orally as a single dose within the first 24 hours after birth; or 0.25 mg orally every 12 hours for 2 days to suppress established lactation (avoid in pre eclampsia, uncontrolled hypertension, cardiac valve disease, severe hepatic impairment, and psychosis; nausea, dizziness and hypotension are common).
• Supportive measures: tight, comfortable bra, cold packs, ibuprofen 400 mg every 6 to 8 hours, and avoiding stimulation of the breasts; milk volume reduces over days to weeks; rebound can occur.
• Bromocriptine is not used because of the risk of severe adverse events (hypertension, stroke, seizure).
• HIV infection: breastfeeding is encouraged when the viral load is suppressed on antiretroviral therapy; individual counselling is required.

Suspected malignancy or atypical findings. Urgent referral to a breast clinic with imaging and core biopsy; do not delay because of lactation; biopsy is safe in lactating women (small risk of milk fistula).

Special groups

• Women with HIV on treatment: support breastfeeding, treat mastitis early, and consider expressing and discarding milk from a bleeding nipple until healed.
• Women with diabetes: tight glucose control, early candida treatment, and low threshold for antibiotics.
• Premature or hospitalised infants: use a hospital grade pump 8 or more times daily; early expression within 6 hours; oversupply and engorgement are treated with frequent expression, warm compresses before and cold packs after expression.
• Women who are not breastfeeding or have stopped: use tight comfortable bra, cold packs and ibuprofen; consider cabergoline in the first 24 hours.
• Women with chronic illness: review drug compatibility with lactation.
• Region specific: avoid harmful practices (hot compresses, vigorous massage, breast binding for prolonged periods); support community lactation counsellors; give antibiotics early when abscess drainage services are far.

Monitoring. Symptoms and temperature daily for 2 to 3 days; response within 12 to 24 hours of improved milk removal; response within 48 hours of antibiotics; baby's weight gain, wet nappies and feeding; recheck persistent lumps at 2 weeks and image if still present.

Referral and escalation. Refer the same day for sepsis, abscess, necrotising infection or suspected cancer. Refer to a lactation consultant for persistent feeding problems. Refer to the infant feeding team or paediatrician for tongue tie, poor weight gain, or a baby who is unwell. Refer to the breast clinic for any lump persisting beyond 2 weeks, skin change, nipple discharge with blood, or recurrent unilateral mastitis. Refer to psychology for distress.

Admission criteria. Sepsis, abscess needing drainage under anaesthesia, inability to take oral antibiotics, failure of oral treatment at 48 hours, necrotising infection, immunosuppression with fever, or unsafe home environment.

Discharge and follow up. Discharge once improving with a plan for milk removal, analgesia and antibiotics. Review at 48 hours, at 1 week and at 2 weeks (for lumps). Arrange breast clinic follow up for lumps persisting beyond 2 weeks, and imaging after the abscess has resolved if there is an underlying mass.

Safety netting. Return at once for any of the following:

• fever of 38.5°C or more, or shivering
• red or hard breast that is worsening, rapidly spreading redness, or skin darkening
• a painful lump, or a lump that does not go away
• pus from the nipple, or bloody nipple discharge
• feeling unwell, calf pain, or breathlessness
• the baby not feeding or not gaining weight