Your question about how dangerous is thyroid cancer is an interesting one. I guess it depends on your concept of danger. On the one hand, it's one of the most
curable forms of cancer (with the exception of a rare kind called anaplastic thyroid cancer). So, as far as your chance of dying, the risks are pretty low. However, the treatments for thyroid cancer do have risks. For example, the surgery can result in permanent problems with your voice, and the radioactive iodine can permanently effect your sense of taste. It can also affect your fertility and increase your risk of developing leukemia later. So I guess my opinion about how dangerous is thyroid cancer would be that it's less worrisome than most other cancers, but I'd gladly suffer through a horrific case of stomach flu, rather than be told I have thyroid cancer.