Hypothyroidism in pregnant women does not usually cause excessive amniotic fluid. Hypothyroidism in pregnant women does not usually cause excessive amniotic fluid. The combination of gestational diabetes and fetal urinary tract anomalies may be the cause of excessive amniotic fluid in pregnant women. In addition, if a pregnant woman with hypothyroidism is not given oral levothyroxine sodium tablets as soon as possible, it is very likely to affect the intellectual and neurological development of the fetus. Pregnant women are advised to pay attention to regular checkups during pregnancy, especially those with hypothyroidism, and must pay attention to regular rechecks of thyroid function and adjust the dosage of medication according to the results of the checkups. If pregnant women experience abdominal pain or abnormal vaginal bleeding at any time during pregnancy, they should pay attention to seeking medical treatment at the earliest possible time.