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.

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.

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.