How safe is a spinal tap? I feel really nervous about having one. I saw a neurologist today who would like me to have one along with another MRI. I read on WebMD about spinal taps. There's a very small chance of nerve damage. I was diagnosed with multiple sclerosis in 2002 with an MRI. I haven't taken any medication so far, but have had trouble with slight dizziness that comes and goes in the last 8 months along with foot pain that has been present since 2002. I decided to see a neurologist, and she says we have to do a spinal tap to make sure that it is MS and how to treat me.