I think mine were squeezing the nerve, when
the right side of my thyoid came out, my singing
voice was better...however, they found that I had cancer, so I had the other side removed. My last surgery was June 09 and I went back to singing and teaching that fall, with no loss of high notes, it is better and clearer. I highly suggest if you are a singer that you find a way to get an ultrasound, if there are nodules, then you will know if that could be a factor.