The loss of the c spine curve "might" be one of those chicken & egg things.
Like did the loss of curve have something to do with ending up with TOS or did TOS problems cause the loss of the curve..

For myself I do believe losing the natural curve was an indicator that something was going on. When I had each of my RSI injuries {hands/wrists,, shoulders, neck, upper back..},, the PTs would always mention the loss of normal curve. But no mention that this could be an indicator of thing to come...in the future.

If they would have stressed how important keeping these curves were, I would have paid more attention to my overall posture and work postures & habits.
And if they had told me about the foam roller use, to open the chest and drop the shoulders - that it reverses the bad postures of forward work...
I would have been using that the whole time and probably been OK.

But never heard of anything like it at all until after seeing about 10 different PTs. Finally the last one I found on my own - had RSI & TOS listed on his info,, he was the one that helped me the most , along with my chiropractor.
I have a video link in the sticky thread about using the foam roller, also a rolled towel will work for starting or trying it. I also lean over my large exercise ball front & back to stretch both ways.

Of course listen to what your body tells you - start easy ,if it is too much back it down,if pain or symtoms are high start by laying out on the floor only.
I did the stretches multiple X's a day when I was in bad shape, and now depends on usages if I feel tightness then I do more to regain & maintain.



But I think a straight c spine alone shouldn't be a cause of arm pain, unless you also have something misaligned, herniated or slipped and impinging on the spinal cord area.

[Kyphosis is outward curvature of the thoracic spine (upper back). Abnormal kyphosis results in the appearance of a hunchback, which is accompanied by back pain, stiffness, and muscle fatigue in the back. There are three types of abnormal kyphosis: postural, Scheuermann's, and congenital kyphosis. Postural kyphosis is caused by poor posture and a weakening of the back's muscles and ligaments. Scheuermann's kyphosis is caused by a structural deformity of the vertebrae. Congenital kyphosis is caused by an abnormal development of the vertebrae prior to birth. Treatment of kyphosis depends upon the type of kyphosis the patient has.] http://www.medicinenet.com/kyphosis/index.htm


[The stability of the cervical spine and its ability to stay in the lordotic position depends on other parts of the spine. The vertebral bodies need to be strong enough to support the head and keep the normal shape of the spine. The facet joints, ligaments, and soft tissues in the back of the neck and back must be strong. And the muscles in the back must be able to resist the effect of gravity pulling the head forward. If there is damage to any of these three areas, a kyphotic deformity can develop, and the weight of the head can cause reversal of the normal curvature of the spine.] http://arthritis-symptom.com/fractur...l-kyphosis.htm

a bunch more links-
http://www.google.com/#hl=en&q=cervi...bc9ba0718e9555

Looks like it goes back to posture, useage, alignment and keeping the head balanced over the body.
Retraining those muscles in the upper back while loosening/opening up the tightened muscles that are pulling forward in the front of the chest.

A good PT should be able to get you going in the right direction, but if you have lots of pain then extra care and pain relief modalities should be the first focus for PT before moving into any active muscle work/weights.


Unless you have a very severe case or a congenital cause anyway.
That is something the Dr should address - how severe and if congenital caused.