Low thyrotropin levels, along with elevated T3 and T4 levels, indicate hyperthyroidism. Patients need to choose the appropriate medication for treatment based on the thyroxine level and the patient’s thyroid ultrasound and other relevant tests. If the patient is in the early stages of pregnancy, the patient may have transient hyperthyroidism, which is mainly related to the patient’s pregnancy status, nausea, vomiting and high HCG and progesterone levels. In particular, patients with severe pregnancy vomiting are often associated with transient hyperthyroidism, in which case the patient’s T3 and T4 levels are mostly normal and do not need to be treated. However, patients need to have their thyroid function checked every two weeks to monitor the thyrotropin level, and if it returns to normal, no treatment is needed. If the level is low, especially if the patient has a history of embryonic arrest or habitual miscarriage, treatment is needed.