Well they you loose an average of 75- 100 hairs a day normally. Also they say (they??) grey hair is tougher than regular hair. I have some of this little grey corkscrews popping up all over my head! They are pretty tough!
You have never had grey hair? NOT FAIR! My grey matter brain wise is gone! Note my typing lol!
My doc had a therory that I was not able to dispute while on tx. He said that the thinning was more a matter of the individul hair shafts thinning, not necessarily wholesale hair loss. Many people have written that they see gobs of hair in the drain and those are the ones who cite hair loss. In my experience, my hair was thinner but not a loss. So, I can't dispute what my doc said, but many can. As for gray hair and gray matter; I've never had a gray hair but it may have been the gray matter that went down my drain.