Brief Answer:
Rule out sensory stroke and metabolic diseases

Detailed Answer:
Good evening.

Whenever symptoms that you describe (paresthesias) are present over only 1/2 of the body then, one of the first things that I think about as a neurologist is STROKE. If there are no motor signs such as weakness or paralysis then, we are talking about what we call a sensory stroke. That would be the first thing I'd think of and the way to determine whether that were correct or not would be to first and foremost do a good NEUROLOGICAL EXAMINATION to see what else what may be going on. Then, add an MRI of the brain (I might also throw in the cervical spine and do it with GADOLINIUM CONTRAST).

Secondly, if the MRI of the brain were negative for any type of stroke (or demyelinating disease) then, I would get blood work and look at levels of nutrients and vitamins such as Vitamin D, D2, D3, Thyroid hormones (FT4, TSH), ESR and CRP (markers of inflammation in the body), Vitamin B12, B6, and Folate.

By the way, I should emphasize that I would NOT get a CT scan of the head.....that is not the test of choice for something like this....you need an MRI so they can look for what is referred to as small vessel ischemic disease in the thalamus, sensory limb of the internal capsule, or within the brainstem in the sensory tract regions of where the spinothalamic or dorsal columns rise through the medullary region.

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