1, the mechanism of action of eugenol for hypothyroidism: eugenol for hypothyroidism is absolutely no problem, because hypothyroidism patient’s self-synthesis of thyroxine is insufficient, give eugenol is a replacement therapy. Mechanism for hyperthyroidism: For patients with hyperthyroidism, if accompanied by proptosis or goiter, a small amount of eugenol can be given as appropriate, in order to inhibit TSH, because when anti-thyroid drugs are given to treat hyperthyroidism, the patient’s thyroxine will be gradually reduced, and so the inhibition of TSH is gradually weakened, and the increase of TSH will aggravate the proptosis or goiter. There is another clinical situation, that is, during the treatment of hyperthyroidism, when the antithyroid drug is a little more, its function will be lowered, and when the antithyroid drug is a little less, its function will be increased, which belongs to the kind of difficult to adjust the drug, and at this time, it can be given to the eugenol and the antithyroid drug treatment at the same time, in order to achieve a balance. 3, for the role of T3, T4, TSH: eugenol should be mainly T4, taking eugenol is equivalent to supplement T4, T4 more, when converted from T4 T3 more, whether T3 or T4 on TSH is inhibited. 4.Different reports say that TSH should be controlled below 0.3 and below 0.5, may I know which one should be the exact one? Generally speaking, the normal range of TSH is fine, and pregnant women are required to have a TSH <2.3, but at the same time, we should observe the patient's heart rate, and if the heart rate is too fast, there is no need to be so strict, in any case, if the nail function is normal, and the heart rate is not too fast, we should let the TSH reach the standard as much as possible.