Breast Pain (Mastalgia): Causes, Relief, and When to See a Doctor

Breast pain affects up to 70% of women at some point. Most is benign, cyclical, and manageable—but new, persistent, or asymmetric pain deserves evaluation. Here’s a practical guide.

Types & Causes

1. Cyclical Mastalgia (Hormonal) — Most Common

Bilateral, upper outer quadrants, dull/heavy/aching. Peaks premenstrually, resolves with menses. Driven by estrogen/progesterone → stromal edema, ductal dilation. Perimenopause: erratic, prolonged. OCP/HRT can worsen or improve.

2. Non-Cyclical Mastalgia

• Focal: Cyst (fluid-filled, benign), fibroadenoma (solid, benign), trauma, surgery scar, costochondritis (chest wall — mimics breast pain).
• Diffuse: Large breasts (Cooper’s ligament stretch), medications (SSRIs, antipsychotics, digoxin, spironolactone), caffeine sensitivity (anecdotal), stress.

3. Inflammatory / Infectious

Mastitis (lactating: milk stasis + bacteria; non-lactating: periductal). Red, hot, swollen, tender, fever. Abscess = fluctuance. Antibiotics ± drainage.

4. Breast Cancer (Rare as Pain-Only Presentation)

~5–10% of breast cancers present with pain. Concerning features: unilateral, focal, persistent (>4 weeks), non-cyclical, associated with lump, skin changes (dimpling, peau d’orange), nipple retraction/discharge (bloody/clear spontaneous), axillary nodes.

Contributing / Aggravating Factors

• Poor bra fit (too tight → compression; too loose → ligament strain). Professional fitting helps.
• High-impact exercise without support.
• Thyroid dysfunction (hypo/hyper).
• Smoking (vasoconstriction, inflammation).

Self-Care & Conservative Management

• Supportive bra: Daytime (encapsulation + compression), sleep bra (soft, wireless).
• Topical NSAID: Diclofenac gel 1% TID ×2 weeks — effective, low systemic absorption.
• Oral NSAIDs: Ibuprofen 400–600 mg q6h PRN (with food).
• Evening primrose oil (GLA): 1–3 g/day — modest evidence for cyclical pain.
• Caffeine reduction: Trial elimination 4–6 weeks.
• Stress reduction: CBT, mindfulness — central sensitization modulates pain perception.

When to See a Doctor

• New, persistent, unilateral, focal pain
• Associated lump, skin/nipple changes, discharge
• Pain interfering with sleep/function
• Male with breast pain (always evaluate — gynecomastia, cancer)
• Postmenopausal woman with new pain

Diagnostic Workup

• Clinical breast exam.
• Imaging: Diagnostic mammogram (± tomosynthesis) + targeted ultrasound. MRI if high risk / equivocal.
• Biopsy if imaging suspicious (BI-RADS 4/5).

Most breast pain is not cancer. But “probably fine” isn’t a diagnosis. Get checked. Peace of mind is a health outcome too.