Hello...when I was pregnant with my second boy (who turns 18 this year) my first husband was diagnosed with papillary carcinoma - thyroid cancer. He had a partial thyroidectomy, then a few months later elected for a full thyroidecomy. He like nursie76's daughter was prescribed daily thyroid replacement medication. Some years later when we separated, he was diagnosed with breast cancer (rare in men) this was NOT connected to the thyroid cancer, he had a double mastectomy and radiation treatment. He went on to re-marry and fathered a healthy little boy. He continues to lead a full and productive life.
We were also told thyroid cancer was the "best" one to have. Also, maintaining a positive outlook, doing any recommended checks/follow ups and try and keep stress to a minimum....all sensible advice for anyone to follow.
It seems you are on the right track...curious but not worried, just the right attitude to adopt. All the best..from the land of Aus.