There are many causes, including simple thyroiditis, which can be secondary to an upper respiratory infection, and nodular goiter, which occurs with regional structural differences and is also related to diet. Simple nodular goiter is caused by the hyperplasia of the thyroid follicles and is associated with a lack of iodine in the diet, and excessive weight loss can also lead to the formation of nodules. In simple thyroiditis, if pain is present, oral pain medication can be taken, and the medication needs to be adjusted according to the results of the thyroid function.