I never really heard about this until I started working in the health care field. I never really understood it until recently. I noticed my hair was falling out. There is also several reasons this could be happening, but none of them have been confirmed as to the reason why. I read about Autoimmune Alopecia, which could be another reason. I don’t know the reason why yet, my hair is growing in other spots, but falling out in others. I will keep monitoring it before I ask my Dr. Hopefully i will know more soon.