Hello,
It sounds like the
pain is between the shoulder blade and the spine and only on one side.
Any history of trauma: car accidents, falls.
Is this your dominant side?
Is it sore to touch?
Does it improve or worsend with activity...if so what kind of activity?
What has your family physician said about the soreness?
Has he or she referred you to a physical therapist or chiropractor?
Any history of osteoporosis?
As you can tell, more imformation is needed about the specifics of this condition. Your family physician can certainly guide you through these questions and answers and make appropriate referrals (eg physical therapy) and testing (eg thoracic or rib xrays to start - perhaps MRI)
Keep us posted.