If a pregnant woman is iodine deficient, she will be thin and malnourished before pregnancy, and after pregnancy, her early pregnancy reaction will be more obvious, her weight will drop significantly, and her thyroid gland in the neck will be enlarged to varying degrees during physical examination. In addition, if a pregnant woman is iodine deficient, resulting in insufficient synthesis of thyroid hormones, it may affect the development of the fetus’ nervous system, or cause the fetus’ brain size and weight to be significantly lower than normal, and once the fetus develops abnormally, it may suffer from miscarriage, premature birth and stillbirth, which may manifest as vaginal bleeding, abdominal pain or fetal death. Therefore, it is recommended to have regular maternity checkups during pregnancy, and if iodine deficiency is found before or after pregnancy, it is necessary to actively consult a specialist and provide symptomatic treatment, and eat foods with high iodine content such as kelp, seaweed, dried scallops and sea cucumber, etc. If necessary, take medication under the guidance of a doctor.