Hi, I have gotten 2 responses from people who came down with pd shortly after taking a thyroid test. Another from someone who said (I'm paraphrasing) that it would be more significant if the symptoms had occurred years after the test because pd takes so long to manifest itself. Maybe you're the one who took years! Another response idea was that thyroid problems are a precursor to the disease. The big question is: why did my husband's test come back negative? He has no thyroid problems but now has pd. I'll keep you posted. Maybe you could research and find out how long ago your test was. Best wishes. Oh, I have a response from a woman who has an autistic child now--she took the thyroid test before that. Interesting. . .