I'm 29 and for the past 3 months my hair has been thinning at a rapid pace. Every time I brush it or wash it loads fall out. I've started a receding hairline. Bloods at the Doctors showed nothing, they have tested thyroid, diabetes, coeliac, iron, full blood counts and hormones.
What could be causing this and will it grow back. Otherwise I'm healthy but bmi is 33