I have read that any kind of immune disease makes you more vulnerable to thyroid disease. So therefore, it might by related!
I don't have any answers for you, but I'm going to follow this post as my TN is flaring lately (not dx'd with MS yet) and I have slightly low thyroid levels. I do sometimes wonder how they're all connected.
I hope you feel better soon.
Hugs,
Laura
"October 20, 2010 (Gothenburg, Sweden) — Patients with multiple sclerosis (MS) are vulnerable to a variety of other autoimmune disorders, including thyroid abnormalities, report researchers."
Here is the link to the article:
http://www.medscape.com/viewarticle/730931
I have read several other sources stating the same thing. Antalya is also correct about those with one autoimmune disease are more prone to other autoimmune diseases.
ren