Hypothyroidism during pregnancy should be treated with medication as prescribed by the doctor. Low thyroxine with elevated thyrotropin during pregnancy should be considered as hypothyroidism, once diagnosed with hypothyroidism need to take levothyroxine sodium tablets under the guidance of the doctor to maintain the thyroid hormone level within a reasonable range, otherwise it may cause preterm labor, miscarriage, fetal intelligence and neurodevelopmental abnormalities and other adverse consequences. Moreover, pregnant patients with hypothyroidism should strengthen the thyroid function examination during the medication period and adjust the dosage of medication cautiously. Pregnant patients diagnosed with hypothyroidism should actively cooperate with the doctor’s treatment and undergo regular review. The use of specific drugs should be under the guidance of the doctor, do not take on their own.