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Index finger twitch

Good morning (from the states), My index finger has been twitching uncontrollably for 2-3 weeks now. Every day, multiples times per day. I'm trying to rule out everything.... some things I know that can cause this are vitamin deficiencies (Mg, vit B, calcium) - I take all of those, so I don't believe it would be that. I do have a desk job & spend a lot of time on the computer, using a mouse. I've read that carpel tunnel does not generally cause finger twitching, but not sure how accurate that information is (my wrist doesn't hurt, it's just my finger twitching). I've been at this same job for 14 years, so if it is a mouse, wouldn't it be odd that it took 14 years for something to go wrong? My last thought is, of course, MS, because I know it can cause some twitching. Is there anything else (other than a tumor!) that would cause this? I have an appt to see my neuro for MRIs and exam but not until mid-March. This isn't an urgent issue anyway so if I can't find a way to resolve this, I'll just bring it up to him in March. Going to try a new mouse that helps with index finger fatigue. Just wondering if anybody has some other ideas I can try? Thank you! Michelle