<s>[INST] My 10 year old son suddenly in the past two weeks has started throwing his head back in what looks like a twitch , stating he is uncomfortable but without a great description. He is also complaining of twitching in his arms and to a lesser degree his legs and recently if you hold his arms in the biceps area you can feel both arms twitching involuntarily. He had a blow to the back of his head a couple of weeks ago which his pediatrician dxd as a probable mild concussion . He has no psychiatric history but is probably a bit on the anxious side, but my gut tells me this is not a psychosomatic symptom. The question is whether to take him to a pediatric neurologist and whether we have anything to worry about. He is basically a healthy kid. [/INST] Hello, Thanks for choosing Chat Doctor for posting your query. From the description that you have given it appears that he is having some kind of neurological movement disorder. There are various movement disorders that are possible for his age. You need to show it to a pediatric neurologist. He will need an EEG and an MRI brain. If everything comes out normal, then there is a possibility that the psychological causes may cause these twitches. Then in that case a psychiatric consultation will be useful. A child with psychiatric illness can look as a very healthy child.  Hope I am able to answer your concerns. If you have any further query, I would be glad to help you. In future if you wish to contact me directly, you can use the below-mentioned link: bit.ly/ Chat Doctor.  </s>