I was tested for carpel tunnel...negative....and nerve studies only showed bi lateral radicupathy at c5c6... Which those nerves go to thumbs which are oddly the only fingers that do not tighten up at night....the problem went from five years ago sudden onset numbness and inflamation...actual swelling ...to now a days tightness swelling and almost locking up while sleeping... numbness i barely have anymore .tried splints...made it worse because my fingers swell so much they get too tight...I can no longer wear my rings....had shots in my fingers didn't do a thing..it's pretty odd and like yours presented....I've heard it's always starting in feet....when I'm seriously stressed my feet get a bit tingly but nothing like my hands...and that's only the past year or so...this happened to me three months after my father was killed in an accident...wondering it the trauma manasefted something or brought out a disease? I fell like the stress is making everything worse....panicking ... How did you find out the cause of your? And what is the cause of yours?