Re: Should I be concerned?
No reason to think this is thyroid cancer yet. If the nodule grows bigger than 1 cm, it should probably be biopsied. But even then, the chances it wouldn't be cancer are better than about 95%. Even if it turns out to be cancer, it's completely curable more than 95% of the time. And lastly, it almost certainly wouldn't be causing pain.
Take one step at a time, and let us know what you find out.