I had a multi-nodular goitre which was noticed by a doctor who had experience in that field. I was then scanned about every 4 months to see if they were growing. They also took fluid out of the two largest nodules to check for cancer but it was clear.
Then, at the end of that year, a nodule had grown larger than 3cm and my thyroid levels weren't normal so I was informed that it had to come out and I would have to take thyroid replacement.
When the thyroid was checked after its removal a small papillary cancer was found which was not in the nodules. I was later told by an Endo that that is quite common.
So, it was probably a good thing that it was monitored.
The only regret I have is not educating myself on thyroid replacement and letting a friendly but ultimately ignorant doctor convince me that a low dose of 50mcg (from 100) was essential in my treatment. (For someone without a thyroid that's a very light dose, and she didn't consider the FT4 & FT3 levels which were mid-range.) This plummeted me into hypothyroidism and all the initially unknown forms of severe fatigue and bodily discomfort that I had no idea about. Further grievances were added when the incompetent colleagues tried to convince me the actual pain was a form of depression!
So, if you do need it removed, this site will be an amazing help and the book 'Stop the Thyroid Madness' - whose combined knowledge empowered me into refusing another crazy low dosage and suggestions of hypochondria in regards to my symptoms. It's a real shame that the 'professionals' haven't experienced these symptoms...
Sorry for the rant there but I would definitely get it checked and monitored. And if it ultimately needs to be removed, learn as much as you can so that you can protect yourself.