After receiving compliments recently on my hair and how it looks thicker these days, my boyfriend mentioned yesterday that he thinks I've got a bald patch at the back of my head. My hair is fine and is due for colouring and I feel sure it's the grey showing through and my parting but he is convinced my hair is thinning. I've asked people at work and they agree with me. My hairdresser hasn't mentioned anything. But now I am really upset and feel worried as I know my hair is fine. Does anyone else have this problem?