ft4 refers to free thyroxine, and high ft4 levels may be important, suggesting that the patient may be hyperthyroid, or caused by subacute thyroiditis, Hashimoto’s hyperthyroidism, or pituitary disease, and require treatment such as medication or surgery. If the patient’s ft4 and ft3 levels are elevated and the TSH level is low, it may be caused by hyperthyroidism, which requires medication, surgery and other treatments. If the patient’s ft4 and ft3 levels are elevated, accompanied by thyroid pain, fever, and decreased iodine uptake in the thyroid gland, it suggests that it may be subacute thyroiditis, which requires the application of non-steroidal anti-inflammatory drugs or hormone therapy if necessary. If the patient’s ft4 and ft3 levels are elevated, along with the presence of thyroid-related antibodies such as thyroid peroxidase antibodies and thyroglobulin antibodies, it suggests that the patient may have Hashimoto’s hyperthyroidism. If the patient’s ft4, ft3, and TSH levels are elevated, it may be caused by pituitary disease, and surgical treatment is needed if necessary. If there is a high free fT4, you should go to the endocrinology department in time, under the guidance of the doctor for treatment.