As I'm sure your doctor told you back when you had thyroid cancer, have any suspicious swollen lymph nodes checked by your doctor. Once you've had cancer once it's always a possibility in the future BUT swollen nodes are also usually a sign of an infection in the body (like when you get sore throats etc) so no matter what don't you think it's better to find out now rather than wait?
I know after going through it once the last thing you want to do is risk hearing the word "cancer" again but you're going to worry no matter what so go get checked. ;)
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