If untreated, how much bodily nerve damage can thoracic outlet syndrome cause?

Significant. Thoracic outlet syndrome can be frustrating as the nerve compression can lead to weakness and/or muscle wasting into the arm/upper extremity. Fortunately, it can be treated with some simple manual medicine techniques(i know because i had the unfortunate circumstance to suffer from it)...So if you can find a reputable osteopath he/she can help you recover.
TOS. Although tos is frequently described to involve the anterior scalene, the most common problem is an anterior attachment of the middle scalene to the first rib resulting in compression of the lower trunk of the brachial plexus. Chronic compression of the lower trunk can result in permanent numbness in the 4th and 5th digits and hand weakness.
Different treatments. Thoracic outlet syndrome is a narrowng between the first rib and a muscle called the anterior scalene muscle. It can cause compression of the artery, vein or nerve. Nerve compression is very common and can cause pain and weakness in the hands. Initial treatment is physical therapy., and ruling ot carpal tunnel syndrome. If that fails, then surgery to remove the first rib can be very effective.

Related Questions

Can poor circulation associated with thoracic outlet syndrome cause complications?

Depends. Depends on whether you are talking about true neurogenic as opposed to disputed neurogenic, venous or arterial thoracic outlet syndromes. Read more...
RISKS. If you have experienced artery or vein compression due to tos, and possess a cervical rib, there is risk of possible local blood clotting, and, on rare occasions, strokes have occurred. Since this can be very complex, and may be benign or more dangerous, best to have a very experienced thoracic outlet surgeon evaluate the blood vessels fully. Read more...

Does surgery for thoracic outlet syndrome cause long term pain?

Caution. Surgery is done to relieve pain. "Long term pain" is probably referring to failure of the surgery to relieve the pain of TOS. TOS is complicated. Vascular TOS needs surgery. Neurogenic TOS should only have surgery after ALL CONSERVATIVE therapy has failed. The surgery is not always successful. Your thoracic outlet is filled with nerves, blood vessels and muscles: serious complications can occur! Read more...

Can thoracic outlet syndrome be caused by MS or fibromyalgia?

No. Thoracic outlet is related to vascular compression and is not related to the other 2 diseases. Read more...
No. Three very different conditions, and although fibromyalgia and TOS can be caused secondary to trauma, MS has no real relationship to injury, and does not cause either problem. Read more...