Hi Polly & everyone,
as a long term sufferer of finger nail problems I can offer you the following information. I had long though a connection in my particular case with my thyroid problem which I have had since the late 70s. Also I am a habitul 'picker' as described which causes trauma to the base of the nail. It is only really my thumbs that are affected by the 'picking' habit although the other fingers show signs of 'Koilonchia'. If you read through my link you may be surprised at the link to certain health conditions and nail trauma. Is this you?http://www.nlm.nih.gov/medlineplus/ency/a
rticle/003247.htm