i have had an enlarged thyroid since i can remember. (20 or 21?) i am a 27 year old female. doctors have always noticed it and took blood tests which have always come back normal. they have felt no nodules on the thyroid. it doesn't bother me at all. sometimes choker necklaces feel tight but that's it.

today my doctor commented on how large it is. she said i should get an ultrasound done. she felt no lumps on it at all. why would i need an ultrasound. can you have nodules or lumps that can't be felt? could i have thyroid cancer? i have no symptoms of hyper/hypo that i can think of. (some bleeding in between periods and sometimes i have a hard time falling asleep at night but i think it's stress related.) i don't have my ultrasound until next month. i am gonna go crazy until then. please help!