It could be a variety of things like a breast lump that is not visible or felt to heart problems. If the pain in your arm is left sided especially, your breast pain may actually be chest pain. Nerve pain can also occur in this location. Time to get an exam by your doctor who can check the breast, but also can order an EKG if he/she thinks it could be cardiac.
Answered Apr 10, 2020
Breast mammography first. Then a shoulder MRI and a cervical and thoracic MRI. A professional exam of the breast is also necessary as well as a complete blood work. Then one could get a diagnosis studying all the elements above. Very probable it is the low cervical or thoracic spine. A pain doc will make you well
Answered May 29, 2016
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