Mastitis is an inflammatory condition of the breast tissue, most commonly encountered in lactating individuals (lactational mastitis), but it can also occur outside pregnancy or breastfeeding (non-lactational mastitis). It is clinically important because it may mimic abscess, malignancy, or inflammatory dermatoses, and because timely management reduces pain, preserves breastfeeding when appropriate, and prevents complications such as abscess formation, systemic infection, and chronic sequelae.
At the mechanistic level, mastitis is usually triggered by disrupted milk flow combined with bacterial colonization. In lactation, incomplete emptying after feeds leads to milk stasis, increased intramammary pressure, and local tissue stress. Microtrauma to the nipple—often from infant latch problems—facilitates bacterial entry, particularly with Staphylococcus aureus. The resulting immune activation involves innate immune pathways, cytokine release, and localized edema. While bacterial mastitis is common, mastitis can also be largely inflammatory or related to viral or autoimmune processes; therefore, the clinical picture and response to therapy guide management.
Clinically, mastitis typically presents with unilateral breast pain, tenderness, erythema, warmth, swelling, and systemic symptoms such as fever, malaise, or chills. A key feature is that symptoms often develop relatively rapidly over hours to days. Patients may report a flu-like feeling and pain that worsens with continued milk production or poor drainage. In early stages, the breast may be diffusely tender without a clear fluctuance. When an abscess forms, the same overall syndrome can evolve into a localized collection with a distinct area of fluctuance, persistent fever despite antibiotics, or failure to improve after initial conservative or antimicrobial management. Non-lactational mastitis may present similarly but occurs in a wider range of settings, including periductal inflammation and smoking-associated ductal changes.
Differential diagnosis is essential. Breast abscess is a primary concern when symptoms are severe, there is marked focality, or treatment response is poor. Inflammatory breast cancer can be confused with mastitis because it may cause erythema and edema without a discrete mass; red flags include progressive symptoms, lack of infectious signs, recurrence, or inadequate response to antibiotics. Other differentials include cellulitis, duct ectasia, granulomatous mastitis, hidradenitis suppurativa, and medication-related skin reactions. Ultrasound is the imaging modality of choice when abscess is suspected; it can also support evaluation of complex inflammatory changes.
Management begins with optimizing milk removal when lactation is ongoing. Continued breastfeeding or pumping is typically recommended because effective emptying reduces stasis and pressure, lowers inflammatory signals, and helps prevent abscess progression. Supportive care includes analgesia with agents such as ibuprofen or acetaminophen, hydration, and rest. Warm compresses or gentle massage may aid comfort and milk flow, while clinicians should avoid aggressive compression that worsens tissue injury. Hand hygiene and addressing latch or breastfeeding mechanics reduce nipple trauma and bacterial inoculation.
When bacterial mastitis is likely—especially with systemic symptoms, significant erythema, or clinical severity—empiric antibiotics are indicated. The choice depends on local resistance patterns, pregnancy status, breastfeeding considerations, allergy history, and severity. Common approaches include anti-staphylococcal coverage; in many regions, agents active against S. aureus are first-line. If symptoms do not improve within approximately 24–48 hours, reassessment is required for abscess, resistant organisms, or alternative diagnoses. Culture of breast milk is considered in recurrent cases, treatment failures, severe illness, or when resistant patterns are suspected.
If an abscess is present, antibiotics alone are often insufficient. Ultrasound-guided needle aspiration or incision and drainage may be required, depending on abscess size, accessibility, and patient factors. Even with abscess drainage, continuation of breastfeeding may be possible under medical guidance, balancing milk flow, comfort, and infection control.
Prevention focuses on reducing milk stasis and microtrauma. Ensuring effective latch, frequent feeding, and early intervention for blocked ducts can lower risk. For non-lactational mastitis and periductal inflammation, smoking cessation and evaluation of underlying duct pathology are relevant. Patients with recurrent episodes warrant evaluation for structural abnormalities, dermatologic conditions, or uncommon inflammatory disorders.
Prognosis is generally good with timely, appropriate therapy. However, delayed treatment increases the likelihood of abscess, prolonged pain, and unnecessary weaning. Persistent or recurrent symptoms require careful reassessment to exclude malignancy or granulomatous disease.
Source: [@usa_older / X]
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