@njp515 I had two treatments of vaginal brachytherapy 4 years ago. These brachytherapy sessions occurred after external pelvic radiation. I haven't had any hair loss. Wait, that's not entirely true. I did experience pubic hair loss but that was in the radiation field. I haven't had hair loss from my head. I believe that one can experience hair loss due to thyroid problems. Have you had your thyroid function tested (TSH)?

Have you talked with your medical provider or anyone else about this?