Lhermitte's Sign - So-called Barber Chair phenomenon. Flexing of the neck produces electric shock-like sensations that extend down the spine and and shoot into the limbs. Caused by trauma to the cervical portion of the spinal cord, MULTIPLE SCLEROSIS, cervical cord tumor, cervical spondylosis or even vitamin B12 deficiency.
I have had this for months and didn't know what it was. I just thought it was part of the MS. I didn't know it had a name!!