You could be experiencing pain and swelling in your thyroid, which is called "goiter". It's just an inflammation of the thyroid. The thyroid is a little, butterfly shaped gland, just below the Adam's apple. It consists of two lobes, one on either side of the throat and an isthmus that connects the two in the middle.
Thyroiditis is inflammation of the thyroid, but there are several kinds of thyroiditis. Some are temporary, and some are permanent.