Thoracic Outlet Syndrome and Eagles are often found together, I have both, one theory I read was because eagles causes you to hold your neck in strange positions, I myself have military neck, this can make symptoms of TOS worse, I’ve read about some people having TOS surgery first, but for me I’ve decided to have my Eagles fixed first and then see if after doing some pt, if the TOS improves by itself, I’m not a medical expert this is just my opinion and I may be completely wrong, but this is how I’ve decided to deal with it. I may eventually need TOS surgery as well but I’m hopeful to fix it with pt.