It sounds to me like a bacterial infection. Bacterial infections are 3 times more likely to cause deep breast pain than candida infections (BAMS).
There is a great article by Anne Eglash regarding a "Breastfeeding Mother With Chronic Breast Pain" who was ultimately (after other courses of antibiotics and diflucan) treated with 3-5 day courses of azithromycin 500mg and was completely healed.
-Laura Spitzfaden LLLL, IBCLC
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