If Hashimoto’s thyroiditis is detected in pregnancy, you should seek medical attention to check thyroid function and thyroid ultrasound, and your doctor will formulate a treatment plan based on the findings. The effects of Hashimoto’s thyroiditis on pregnancy are related to elevated thyroid autoantibodies and abnormal thyroid function, which may lead to miscarriage, preterm labor, stillbirth, as well as an increased incidence of pregnancy-related diseases. It is important to review thyroid function regularly during pregnancy and to use levothyroxine sodium replacement therapy once hypothyroidism is detected; if treatment is delayed, it may affect the neurodevelopment of the fetus. Patients with Hashimoto’s thyroiditis should pay attention to restricting high iodine foods in their diets. They can eat iodized salt, but they should limit the intake of high iodine foods such as nori, kelp, and sea shrimp. Patients who find Hashimoto’s thyroiditis after pregnancy should follow the doctor’s instructions to standardize the treatment, so as not to delay the condition.