A friend of mine asked me this question yesterday and I did not have an answer that I was 100 percent sure was correct. As I understand, a large thyroid gland is caused by either Graves or Hashimoto's when the thyroid gland hypertrophies in order to attempt to or make more hormone. Am I off on this? I am sure it is not as black and white but can one develop an enlarged thyroid when on medication if they are simply just hypo?
Enlarged thyroid? Can it occur in patients who ... - Thyroid UK
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