Slipped rib syndrome has been mentioned before, here’s a link to a discussion you might find interesting:
Slipped rib syndrome - General - Living with Eagle
Unfortunately quite a few members who have venous compression seem to be prone to other venous compressions, like Nutcracker and May Thurner, … ES can cause arm/ shoulder weakness and/ or pain, so that could be causing your arm weakness, but otherwise you could have TOS causing the arm symptoms & something else causing the abdo symptoms?
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