Costochondritis: The fact that you describe it under the breast and worse with breathing suggests the problem is in your chest wall and not your breast. Most likely a condition known as costochondritis. A painful condition of what we think is inflammation and irritation in the muscles of the chest wall. Don't really know what causes it. Anti-inflammatory (ibuprofen, naproxen) moist heat to area can help.
Answered 9/11/2015
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