High free thyroxine ft4 may be caused by Graves’ disease, subacute thyroiditis, medication hyperthyroidism, etc., which need to be treated under the guidance of the doctor, such as medication, iodine 131 treatment. 1. Graves’ disease: can be combined with hyperthyroidism, need to take propylthiouracil and other anti-thyroid medication, or also consider iodine 131 treatment; severe hyperthyroidism, drug treatment is ineffective, such as the case can be considered surgical treatment. 2. Subacute thyroiditis: In the early stages, free thyroxine can be elevated. Because this disease is a self-limiting disease, symptomatic treatment is the main focus, with pain symptoms can be treated with ibuprofen, severe symptoms can be treated with prednisone. 3. Pharmacological hyperthyroidism: commonly caused by hypothyroidism patients in the process of treatment with too large a dose of medication, at this time under the guidance of the doctor to reduce the amount or temporarily stop the drug to wait for the recovery of thyroid hormone levels before continuing to use the drug. If the free thyroxine ft4 is high, it is recommended to go to the hospital and ask the doctor to make a judgment and give the treatment plan.