I get tingling too. I have it in my head, especially on the left side, but also in the upper spine. I guess that the tingling is neurons firing for the wrong reasons. Either they must have got sensitised so that they are firing when they shouldn't be, or else there is something that is stimulating them to fire, perhaps some chemical that is being released, due to damage. I have mentioned this to doctors but none of them has ever even suggested what the cause is. CS