MS is an autoimmune disease. Hypothyroidism's most common cause (Hashimoto's) is autoimmune, as well. A person with an autoimmune disorder is often prone to other autoimmune attacks as well.
My advice is to have labs drawn including TSH, Free T4, Free T3, TPO Antibodies and Thyroglobulin Antibodies to at least determine if there is an underlyoing autoimmune thyroid problem goin on.
American Thyroid Patients Board Member
American Thyroid Patients Patient Advocate
I am not a doctor, nor have I ever played one on TV...