Our expert says:
It could be a number of things, and trying to guess is pretty impossible and reckless too, because the treatment is based on the diagnosis and I would hate to guess wrong and then mistreat. So I think that what he has to do is see a physio who can then assess what might be causing it. It may be muscular, in which case it could be treated with a little supervised rehab and some home exercises. It may also be something related to the spine/vertebral column, and maybe he will need to see a chiropractor. What you really need to do is have him see someone for it - I know that many physios prefer that you see a doctor, get referred, and then they take it from there. That is the best and safest option.
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