Stims - what's wrong with it?
Biggest risk factor for arthritis (beyond genetics) is repetitive movement, such as that involved in holding a job and making the same movement over and over, like at a factory. But you'd have to be doing the same stim for eight or more hours a day to even match the risk that a factory worker runs.
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To a lesser extent I also click my knees, toes, ankles, hips and jaw... I can't stop! And it does seem to really annoy people.
Everything that I've read says that it's an old wives tale. It can cause soreness and some muscle strain, but it clears up once you stop cracking your fingers.
Yeah, I've looked into this a lot myself a few years back, because that's one of my habits, too. I've not found any conclusive studies that say that it has anything to do with Arthritis.
I tend to crack my knuckles (and toes, and jaw), bob my leg, flap my foot, and twist my hair as stims. I've gotten some comments from people over the years about it and more than a couple of funny looks, but it's not really had much of a negative impact. They're all relatively discreet ones, though. The most overt it gets it when I'm walking around and still twizzling my hair over and over.
I tend to bite too, but usually just people I'm affectionate with. My hygiene squicks always kept me from biting pens/etc. :p
I remember reading this awhile back:
'One M.D. convincingly put that amateur argument to rest with a study published back in 1998 in the journal Arthritis & Rheumatism entitled “Does Knuckle Cracking Lead to Arthritis of the Fingers?” The work of sole author Donald Unger was back in the news in early October when he was honored as the recipient of this year’s Ig Nobel Prize in Medicine. The Igs, for the uninitiated, are presented annually on the eve of the real Nobel Prizes by the organization Improbable Research for “achievements that first make people laugh, and then make them think.” In Unger’s case, I thought about whether his protocol might be evidence that he is obsessive-compulsive. From his publication: “For 50 years, the author cracked the knuckles of his left hand at least twice a day, leaving those on the right as a control. Thus, the knuckles on the left were cracked at least 36,500 times, while those on the right cracked rarely and spontaneously.”'
http://www.scientificamerican.com/artic ... k-research
Of course, an n of 1 doesn't really say much, but at least it's something.
CockneyRebel
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Well you get that area to yourself then (win-win!)- I don't see anything wrong with humming out loud. When I was in art school there were music majors who walked everywhere singing. People walk around whistling. I don't understand why they would swim away! How stupid! I can understand wanting to hum while you are in water because it is so soothing.
When my daughter was younger she would sing all the time. I would push her in the shopping cart and she would sing away to herself. She would get lost in her little play world and sing away- and her voice was clear like a little angel. It makes me happy when people hum,sing, whistle to themselves because it sounds like a happy thing.
To a lesser extent I also click my knees, toes, ankles, hips and jaw... I can't stop! And it does seem to really annoy people.
I pop all over my body because I have a connective tissue disease. It isn't a stim for me, and I dont do it on purpose- it often signals my joints going back into their sockets
I am an artist and I am on my computer all the time. Loss of mobility in my fingers would devastate me too.
I'm usually twiddling or twirling something unless my hands are fully occupied, and I rock to calm down (although not in front of people). I'm a very tense person, and if I couldn't dissipate stress with these behaviors I'd lose my mind. 
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I just try not to do it in public. I don't know why you wouldn't do it at home, except that it could become a "habit," which you then might do in public, which then might open you to ridicule that could hurt your feelings.
The one thing I gotta stop doing is talking to myself at work. I don't do this all the time - maybe 1-3x/week. One day I'm going to say something out loud that will get me in trouble, or worse, fired.
