Hypothyroidism, referred to as hypothyroidism, is caused by insufficient secretion of thyroid hormones, resulting in lower metabolism, fear of cold, bloating, sluggishness, lack of speech and laziness, loss of appetite, bloating, slow heartbeat, and constipation. Insufficient thyroid hormone in pregnant women will affect the growth and development of the brain and body of the fetus, which will lead to cretinism, short stature, mental retardation, unresponsiveness and rough skin after birth. Pregnant women with hypothyroidism must maintain a stable thyroid function to ensure the health of both mother and child. Currently, thyroid function screening has been included in more and more units for routine preconception and prenatal screening, but the importance of the thyroid gland is still not given enough attention in the group of mothers-to-be. 1. The causes of hypothyroidism include: ① thyroxine synthesis disorders, such as long-term iodine deficiency, long-term anti-thyroid medication, congenital thyroxine synthesis disorders and idiopathic hypothyroidism; ② substantial thyroid lesions, excessive destruction of glandular tissue caused by surgery or radioactive iodine 131 treatment, abnormal development, thyroiditis, etc.; ③ pituitary or hypothalamic lesions. The most common form of hypothyroidism in pregnancy is autoimmune thyroid disease, namely chronic lymphocytic thyroiditis (Hashimoto’s disease), in which the antibodies produced by the body’s immune dysfunction cause diffuse lymphocytic infiltration in the thyroid tissue, leading to enlargement of the thyroid gland and hypothyroidism. 2. Hypothyroidism starts insidiously, progresses slowly and lacks characteristic early symptoms, sometimes up to 10 years or more before the typical symptom: mucinous edema appears. Therefore, it requires a high degree of self-vigilance on the part of the patient or family, and usually three thyroid function screenings during pregnancy. The first time is before pregnancy, and if abnormal, it is important to treat the disease before considering pregnancy. The second time is in early pregnancy and the third time is in mid-pregnancy. 3. There are many similarities between the manifestations of abnormal thyroid function during pregnancy and the uncomfortable reactions during pregnancy, which can be easily confused. In contrast, patients with low thyroid may experience fear of cold, swelling, weight gain, dry skin and loss of appetite. These symptoms also occur in many pregnant mothers-to-be. 4. There are more miscarriages, stillbirths and low weight intrauterine growth arrests in pregnant women with low A without proper treatment, care and close monitoring. American and Dutch scholars have also found that pregnant women who develop low thyroid hormones during pregnancy are four times more likely to have children with autism than their healthy counterparts. Scientists at the Methodist Neurological Institute and the Erasmus Medical Center in the Netherlands selected 4,039 Dutch mothers and their children for the study, which showed that children with autism had more pronounced symptoms if their mothers were severely deficient in thyroid hormones, while mild deficiencies in thyroid hormones had little effect. The study, published in the Chronicle of Neurology, confirms that autism spectrum disorders may be caused by maternal thyroid hormone deficiency. Previous studies have shown that thyroid hormones play a critical role in the migration of fetal brain cells during embryonic development. 5. Pregnant women with hypothyroidism must maintain stable thyroid function in order to ensure the health of both mother and child. The medication used to treat hypothyroidism during pregnancy is clearly defined as oral levothyroxine. Other thyroid medications, such as thyroid tablets, are not recommended. Pregnant women with low thyroid need to keep warm, not to get cold, to prevent colds and to be properly active, such as walking. Go to public places less often to prevent infectious diseases. 6, enhance nutrition: should eat more high-protein food, fresh vegetables, fruits, drink more water, avoid spicy food, pay attention to rest, maintain emotional stability, supplement multivitamins, enhance resistance. 7. Limit fat intake: “Thyroxine is a fat-dissolving hormone. In hypothyroidism, plasma cholesterol is excreted slowly, so the concentration of plasma cholesterol is very high. The intake of fat should be limited to reduce the concentration of plasma cholesterol. 8. Iodized salt supplementation: Applicable to endemic goiter areas. Women during childbirth should pay more attention to iodized salt supplementation to prevent their offspring from developing cretinism due to maternal iodine deficiency. 9. Insufficient thyroxine can affect the synthesis of erythropoietin and result in reduced bone marrow hematopoiesis, and is also associated with excessive menstruation, impaired iron absorption, gastric acid internal factor, vitamin B12 and folic acid deficiency. It is necessary to supply sufficient protein during pregnancy. Usually, the amount of high-quality protein supplied per person per day should exceed at least 20 grams to maintain the balance of protein in the body. Once there is a decrease in protein, it is necessary to supplement the necessary amino acids and supply sufficient protein to improve the condition. Therefore, more eggs, dairy, meat, fish, etc. should be consumed, and attention should be paid to the complementarity of plant and animal proteins. 10.Pregnant women with hypothyroidism should see the doctor monthly to check T3, T4 and TSH as a reference to adjust the drug dose. If you feel good about yourself during pregnancy, are not afraid of cold, no swelling, good appetite, normal heartbeat and no constipation, it means that the thyroid medication dose is appropriate; if you are afraid of cold, swelling, lazy, poor appetite and constipation, it may be that the medication dose is not enough; if you are afraid of heat and have a fast heartbeat, it often means that too much medication is used. Constipation is an indication of an appropriate dose of thyroid medication; if there is fear of cold, swelling, laziness, poor appetite, and constipation, the dose of medication may not be sufficient; if there is fear of heat and rapid heartbeat, it often indicates an excessive amount of medication.