I have never replied to a thread before. I was checking this out to come to some type of diagnosis for myself. I am a dental hygiene student and recently noticed this year that my right index finger would go white when it was cold. It is a total loss of circulation..my other fingers are fine. I do notice a clicking noise in my finger when I bend it during these times..and only the end 1/3rd of my finger goes white. I am healthy and fit. I have been tested for diabetes, thyroid etc and everything is good. During the summer I have no problems but winter is coming and I wonder how I am going to cope.