He doesn't have any condition, but as I said in the title, when he runs or gets up quickly, his hands and face contort. He looks like he has cerebral palsy, but only for a few seconds. He is very conscious of it.
That sounds very upsetting for him, especially if he is very aware of it. I couldn't even guess at what it could be, but it does sound like you could do with showing the Dr. Could you possibly record him on your phone in case he can't replicate it in the Dr's office?
I think you need to go to GP and explain the problem and as PP said, a video may support what you're saying. It sounds unusual, perhaps a neurological thing? It definitely needs investigating. It must be worrying for you but best to go to GP and get it sorted out xx
Could it be this? Did his father ever have it? I would ask to see a paediatric neurologist.
Paroxysmal kinesigenic choreoathetosis (PKC) is an autosomal dominant neurologic condition characterized by recurrent and brief attacks of involuntary movement triggered by sudden voluntary movement. These attacks usually have onset during childhood or early adulthood and can involve dystonic postures, chorea, or athetosis. Symptoms become less severe with age and show favorable response to anticonvulsant medications such as carbamazepine or phenytoin. It is the most common type of paroxysmal movement disorder.
That is it! That is it! Heebiejeebie you're a genius! Yes, DH also has it. I have just read the description to DH and he said that is what he has been trying to explain to doctors for 25 years! None of them knew what he was talking about.
So glad it sounds right to you and your husband (and that it's such a benign thing)! The GMC takes a very dim view of internet diagnosis, so I'm always a bit wary, please do go and see someone properly.