When I first went to the doctor with a symptom of 'tingling toes', he ran me through a battery of tests and we discovered I was deficient in B12. At first, we thought it (the tingling toes) could be due to the fact that I was a strictly practicing vegan (consuming no animal products whatsover) and hoped that after receiving a series of B12 injections to get levels up to normal - after which I'd receive monthly injections to KEEP me normal - my sypmtoms would go away. They did not. That's when an additional symptom appeared, Lhermitte's sign. It was at that point I was referred to a neurologist for consult, MRI and spinal tap. The MS diagnosis came shortly afterward.

Whether my b12 deficiency is related to the MS or not I don't know, but having both the deficiency and the MS diagnosis does seem to be pretty common amongst the people who post on the MS message boards....