@cindiwass Hashimoto's thyroiditis causes thyroid nodules. I have that and have had a needle biopsy to rule out cancer. That is done in an interventional radiology lab after they inject a painkiller. I have multiple nodules and over a few years, they have reduced in size after I began taking natural desiccated pig thyroid hormones. It's an easy test. I see a functional medicine doctor who manages my thyroid and he says that some patients cannot convert the components in the synthetic thyroid medication. The natural version has all of them present while the synthetic does not. Here is some information about thyroid nodules.
https://www.mayoclinic.org/diseases-conditions/thyroid-nodules/symptoms-causes/syc-20355262