Any hair loss or thinning issues after being cancer free?

Hi everyone just curious to know if anyone has experienced any issues with hair loss or thinning after treatment that seemed to be out if the blue? I've had tests and so far nothing wrong and no other symptoms.  My hair is baby fine and falls out when I wash it or brush it and has been going on a few years. It is easily breakable and doesn't look good unless I wash it and blow dry it everyday and use conditioner. I've had tests and so far it remains a mystery.  I do take a beta blocker but my doc has said that it is rare for that to cause hair thinning and loss even though it is listed as a side effect.  Please respond if you can relate.