Wife's Unexplained discomfort

[Neil__0]

  Shortly after the birth of our second child, (18 months ago), my wife began experiencing an aching sensation on her right side, below her arm pit adjacent to the breast.  This sensation/pain was intermittent in occurrence, but has increased in frequency to the point where it occurs daily now.  She has had a sonogram, a Cat Scan and has been examined by an oncologist specializing in breast cancer.  No tumors or other abnormalities were found, but her discomfort persists.  Our physician prescribed an anti-inflammatory (Voltaren) to see if this would eliminate the pain and this had no effect on her symptoms.  She is 33 years old, non-smoking and is otherwise healthy.  She is very concerned about not having an answer to this problem. What are some additional courses of action we could pursue to help diagnose this problem?
===========================================================================
Dear Neil:
Neurological causes are relatively low on the list of chest wall pain. They include disorders such as pinching of cervical or thoracic nerve roots (rare), herpes zoster (shingles), a form of diabetic neuropathy, and some other rare problems. Relatively more common are disorders of the chest wall and ribs (specially what is called "costochondritis") and disorders of the lung and pleura.
Seeing a neurologist at some point is not a bad idea, because the neurological causes that I mention are often not easily diagnosed by internists and family physicians.
In case you wish to seek an opinion from neurologists at the Cleveland Clinic, you may want to call [phone] or [phone] for an appointment.