A goiter is an enlarged thyroid gland, and a nodule is a lump. Think of goiters and nodules as signs that something may be going on in your thyroid gland. But like any kind of thyroid disease, it takes some medical investigation to find out what's going on. In this chapter, we'll take a look at these two irregularities of the thyroid gland, including how to spot them and the treatment options available for each.