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As I understand it, one stims when one is uncomfortable, he is my son and I want to comfort him.
I stim for many reasons. I can identify three main categories of stims I engage in.
Firstly, background stims. These ones I tend to do very frequently, especially when I'm concentrating. I'm often unaware I'm doing them. They indicate very little, if anything, about my current mood - more often if anything seems to trigger them it's a sensory aspect like things being too quiet or me having sit still too long. These are the hardest to suppress, if I want to, because I often don't realize I'm doing them.
Secondly, emotion stims. These express emotions, just like facial expressions or body language. Not just unhappy ones, though - I also have some happy stims. (If you go on youtube and search for 'happy dance autism' you'll find a bunch of autistic people showing off their happy stims.) These can be suppressed about as easily as not smiling when you're happy or not crying when you're sad.
Thirdly, play stims. These are ones I do consciously and deliberately, specifically because I like to do them. These are the easiest to suppress, because I chose whether or not to do them, but they often serve a purpose of amusing, calming or reassuring me.
In my experience working with autistic kids, it seems that their stims fall into these categories too. But which stims fall into which category is unique to each person.
For me:
Background stims - hair-twirling, gentle rocking, chewing my lip, biting my nails, picking at scabs (these last three I try to suppress if I can because they can cause pain if done too much)
Happy stims - jumping, hand-flapping, trilling or squealing
Unhappy stims - vigorous rocking, hand-shaking (different from flapping because my palms are vertical instead of horizontal and my wrists are rigid), arching my back, monotonous wailing, also my self-injury (punching myself, biting myself)
Deliberate stims - sometimes my hair-twirling falls in this category, and also flicking my fingers in my peripheral vision or flicking my hand through elaborate motions in the light, and staring at shiny things while either rocking or moving the shiny thing
For your son it'll probably be different, but I'm guessing if he doesn't have stims of every type, he has at least more than just unhappy stims.