[crazy4cats]

I really kind of doubt that the thyroid is the issue as you haven’t mentioned any lethargy or weight gain along with the hair loss. But it is one of the symptoms. Last year when my oldest cat had a senior blood panel test, it showed her thyroid levels off. Then they did another more specific test for the thyroid. I’m guessing it would have shown up on the test you already had, but not sure.
I’m sure you have already checked for fleas. Also, it is so itchy outside right now anyway. Everything is dry and there are so many bugs. Maybe it is a seasonal thing?
Oh, the worry these pets cause!