Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
Pain along the left lower chest below breast, in a known case of stage I ductile
breast cancer can be due to one of the following reasons:
Costochondritis as the commonest reason.
Local invasion of cancer into the muscles and/or ribs.
Spinal problem in itself like compression of nerves or may be secondary of cancer.
Hence I would advise you the following.
Please discuss these possibilities with your Doctor as you are a VA entitled person.
Request for an
MRI of the spine and the chest wall.
Clinical examination by a
General Surgeon.
All these things will lead to a proper diagnosis.
Hope I have answered your query.
Let me know if I can assist you further.