Free thyroxine is generally referred to as FT4. High FT4 may be caused by diffuse toxic goiter, autonomous high-functioning adenoma of the thyroid gland, subacute thyroiditis, etc. Drugs, surgery, radioactive iodine therapy, etc. can be chosen according to the condition.
1. Diffuse toxic goiter: specific antibodies appear in the body, stimulate the hypothalamus, cause thyrotropin receptor cells to be overactive, and the increased secretion of thyrotropin can cause an increase in the production of thyroid hormone, resulting in high FT4. Treatment includes drug therapy such as methimazole, surgery and radioactive iodine therapy.
2. Thyroid autonomous hyperfunctioning adenoma: It is mostly due to the uncontrolled secretion of thyroid hormone by the adenoma, which causes high FT4, and is often accompanied by symptoms of hyperthyroidism such as excessive sweating, irritability, etc. Surgery is needed if necessary. Surgery is needed if necessary.
3. Subacute thyroiditis: mostly due to the destruction of the thyroid follicles, in which the stored thyroid hormones are released into the circulation, which can cause FT4 elevation, that is, hyperthyroidism, for hyperthyroidism caused by subacute thyroiditis, it can be recovered on its own, can be directed to the treatment of subacute thyroiditis, the application of ibuprofen for pain relief, and when the symptoms are serious, can be applied to the hormonal treatment of methylprednisolone and so on.
Free thyroxine may also have other causes, if the free thyroxine is elevated, it is recommended that the patient under the guidance of the doctor to improve further examination, a clear diagnosis.