http://www.tosinfo.com/pdf/jnma_0612.pdf

http://www.tosinfo.com/pdf/jnma_0111.pdf

http://www.tosinfo.com/pdf/jnma_1010.pdf

Read those articles. See how the author demonstrates that when we have decreased venous supply in the T.O., it diverts to the vertebral venous plexus/Batson's plexus, and causes pain in other places (legs/feet/hips/pelvis). Your blood, lymph, etc. is being deprived of its nutrients and starts backing up in other places. Not to mention the obvious postural changes that come w/TOS causing issues themselves. Also, I think this is why so many people w/TOS get RSD because the blood isn't flowing where it needs to be.