Just need to get something off my chest

It all started in December when I was getting checked out by my new (awesome) doctor.  "Your thyroid is a little on the bigger side," she said, hands on my neck, "We should get some bloodwork on that just in case.  It's probably nothing though."

Bloodwork came back perfectly normal, I got to crack an off-color joke on Twitter, and life went on.

So the other day I was back at the doctor's office and she was frowning at her computer before the procedure started.  "I was just looking back at these notes about your thyroid.  The bloodwork was normal but we should probably have this checked out with an ultrasound.  Just in case."  I agreed.  Better safe than sorry.  Safe from what?  I have no idea.

I didn't think much about it until I made the appointment at the radiology office today.  Safe from what?  What exactly do I need to be looking out for here?

So now I'm paranoid about thyroid cancer.  Great.