Regular adrenaline "ticks"

[silnorway]

Hello. I am a 27 year old norwegian girl (soon 28). I'm normal height, slim and eats normal. No work out, occasional smoker.

Ever since I was a kid, I've experienced short ticks of adrenaline (or at least that's the thing I compare it to).,  It's important to note that this does not happen when I'm stressed or in any special situations. It happens for good reasons, and for no reason.
It can happen several times a day, an hour, or sometimes not for many days. What happens:
I feel a sensation of wellness/goodness (it feels positive) that goes from my mid torso - between stomach and chest-ish. It spreads to most of my body, and it tightens my muscles/stiffs me up, while I also shake a bit and my face get's a weird grimace. I can stop it and not make the face, shake, stiffen up etc - because well, I can't be sitting doing that at work (it looks pretty stupid I imagine).
Some examples of when I get these ticks:
I lay in bed, sit up slightly to turn a lamp off, then lay back - get it.
I'm just walking and getting something, feeling stress free - get it.
I can get it while walking inside my apartment to get something in the fridge, closet etc.
No reason whatsoever, can just suddenly get it.

I've never had any geat mental health issues. I struggled some when my father died, but would still get them. When I moved away and felt alone I'd still get them. When I'm at my most happy I also get them.

I did not cover it up when I was a kid, which lead my parents to suspect I had epilepsy (I do not). I was even submitted to a hospital for checkup. Turns out I'm healthy, they had no idea other then that.
I asked my mother about it, and she tells me she has seen my brother get them too. (he is 19).

All in all, this does not seem like a health risk - but I'd really like to know why my body does this. Anyone got a clue? :)

[specialmom]

Hm, hard to say.  My son gets motor tics but they are very different than what you describe.  His tics are repetitive , involuntary movements and are worse when he is anxious or excited.  He has anxiety and sensory integration disorder.  These really don't sound like what most think of as 'tics'.  

They sound a bit more 'seizure' like to me.  Absence seizures to be exact.  However, you say they checked you for things like this.  So, perhaps you should see a neurologist next. good luck