Oh brother. Of course it is an autoimmune disorder. Look up Alopecia Areata. My son lost 3/4 of his hair at 15. After 3 months under Chinese medicine, in China, he had 99% of it back. They have known this for decades if not centuries. According to his doctors over there, it was an imbalance between kidneys and liver. Tough to argue with success.
I noticed yesterday that my hair was coming out by the roots, didn’t hurt, but when I tried to pick out a knot, it just pulled it all out. And today I found some extra hairs. uggg Oh well, I knew it was coming.