Hypothyroidism is the abbreviation of hypothyroidism, and the manifestations of hypothyroidism during pregnancy include bradycardia, fatigue, and chills. There is individual variability in the clinical manifestations of hypothyroidism during pregnancy. Hypothyroidism is an endocrine disease caused by thyroid hormone resistance or thyroid hormone deficiency that reduces the body’s metabolism. Patients with hypothyroidism during pregnancy may have a series of symptoms such as memory loss, constipation, fear of cold, bradycardia, fatigue, hypothermia, lethargy, and dry skin. Pregnant patients suffering from hypothyroidism should take levothyroxine sodium tablets as prescribed by the doctor to maintain a stable level of thyroid hormones in the body. Poor control of hypothyroidism may affect the fetus, leading to spontaneous abortion and premature delivery. Pregnant women diagnosed with hypothyroidism should take standardized treatment under the guidance of a doctor.