Can't tell that just by pain, but they can do a Thyrgen test on you to see of your thyroglobulin has spiked, that will tell you if you are having a recurrance. I have had one, it is pretty easy, they inject you two days in a row with Thyrogen, then a blood test for the thyroglobulin. If your thyroglobulin is spiking, that means it is back. No or little thyroglobulin, no recurrance. Don't ignore it, though.