Thyroid nodules are a common condition that is usually benign and most patients do not become malignant and grow slowly, and do not cause clinical symptoms. Thyroid nodules are related to endocrine, emotion, diet and exertion, etc. Thyroid nodules may increase during pregnancy, but there are many factors that affect the growth of thyroid nodules and should be observed. The thyroid nodules should be closely monitored during pregnancy, but if there is no significant change, the nodules may continue to be observed without treatment. If thyroid nodules increase rapidly during pregnancy, a high degree of attention should be paid and patients should be admitted to the hospital immediately for examination and treatment, checking thyroid function and active intervention if they develop uncomfortable symptoms.