[ad_1] Thyroid-stimulating immunoglobulin (TSI) is an autoantibody that can act on the thyroid gland, causing hyperthyroidism or Graves’ disease. TSI binds to the TSH receptor on thyroid cells, stimulating the growth of the gland and increasing the production of thyroid hormone. This can cause physical symptoms such as bulging eyeballs and swelling of the skin. […]