What Is It?
Several other non-cancerous conditions can cause lumps, pain, discharge, or inflammation. Correct diagnosis is important because symptoms can overlap with cancer.
How Common Is It?
Breast cysts, infections, duct ectasia and trauma-related changes are common reasons for breast symptoms and imaging.
Causes & Risk Factors
- Breast cysts: fluid-filled sacs, often influenced by hormones.
- Mammary duct ectasia: widening/inflammation of ducts, more common around perimenopause.
- Mastitis/abscess: infection, most often during breastfeeding but can occur otherwise.
- Fat necrosis: benign lump after trauma or surgery (may mimic cancer on exam).
- Galactorrhea: milky discharge unrelated to breastfeeding, sometimes due to medications or hormonal (pituitary/thyroid) causes.
Symptoms
- Cysts: smooth, round lump; may be tender and fluctuate with cycle.
- Duct ectasia: discharge (often thick/colored), nipple tenderness, possible lump near areola.
- Mastitis: redness, warmth, pain, fever; abscess may form a tender, soft mass.
- Fat necrosis: firm lump; can occasionally pull on the skin if superficial.
- Galactorrhea: milky discharge (often from multiple ducts), sometimes with menstrual changes.
When Should You See a Doctor?
- Any new lump that persists.
- Fever, spreading redness, severe pain, or a rapidly enlarging tender mass.
- Bloody/clear spontaneous discharge (especially one-sided/single-duct).
- Milky discharge when not pregnant/breastfeeding—especially if persistent or with headaches/vision changes.
How Is It Diagnosed?
- Clinical exam and imaging (ultrasound and/or mammography).
- Aspiration for cysts or suspected abscess.
- Biopsy when imaging is indeterminate or suspicious (fat necrosis can mimic cancer).
- Blood tests for galactorrhea when indicated (e.g., prolactin and thyroid tests).
Treatment Options
- Cysts: observation or aspiration if painful/large.
- Duct ectasia: supportive care; antibiotics if infection suspected; surgery is uncommon but may be considered for persistent symptoms.
- Mastitis: prompt medical treatment; abscess may require drainage.
- Fat necrosis: often observation after confirmation; surgery is uncommon unless bothersome/uncertain.
- Galactorrhea: treat underlying cause (medication review, endocrine evaluation).
Is It Cancerous?
These conditions are benign, but some can closely resemble cancer. Persistent or atypical findings may require biopsy for certainty.
Can It Affect Fertility or Pregnancy?
- Most do not affect fertility.
- Mastitis and duct blockage can affect breastfeeding comfort and milk flow; early treatment usually helps.
- Galactorrhea can sometimes be linked to hormonal imbalances that affect menstrual cycles and fertility; evaluation is important when relevant.
Key Takeaways for Patients
- Many benign conditions can cause lumps, pain, or discharge—and most are treatable.
- Infection symptoms (fever, redness, worsening pain) need prompt medical attention.
- Perimenopausal nipple discharge can be due to duct ectasia but should still be evaluated if spontaneous or bloody.
- If imaging is unclear, biopsy is the safest way to confirm a benign diagnosis.