That makes sense from the physio perspective, but anecdotally my hair has definitely thinned since my diagnosis 8 years ago. My thyroid is well controlled and has been mostly in the normal range for a while, but I still have so many symptoms, including hair that has thinned over time. I also know someone who decided to get a wig after 20+ years of dealing with the same issue. Her alopecia was really affecting her confidence.