There was a recent study (in 2018, I think) that revealed a definite connection between TNFa inhibitors and peripheral neuropathy, particularly in people with pre-existing neuropathy and/or a genetic susceptibility to it. Do a Google search for that study. Everything I've read suggests that, in most people, the neuropathy improves when TNFa therapy is stopped. I assume you're seeing a neurologist?
FYI: A year or two ago, I developed some neuropathy in my right hand and arm that my doctors initially suspected might be linked to Enbrel therapy. Turns out it was unrelated. Sounds like your doctors are ordering the correct tests (e.g., brain MRI), but make sure they check everything and don't just assume it's Humira. Make sure they check for Vitamin B12 deficiency, for example.
Last edited by Winston; 01/14/20 05:37 PM. Reason: typo