The presence of a mild hypothyroidism in pregnancy may have no effect on the fetus, while a persistent severe hypothyroidism may have consequences.
In pregnant women, if a low thyrotropin is present, the magnitude of the decrease needs to be clarified, and it is also important to determine whether it is accompanied by other functional abnormalities. If it is only slightly low and is not accompanied by other abnormalities, it may be normal and will not affect the fetus, and does not require special treatment.
However, if a pregnant woman has a significant decrease in thyroid stimulating hormone, accompanied by other indicators of abnormality, such as a significant increase in free T3 and T4, it may affect the health of the fetus, resulting in fetal growth retardation or mental retardation, and may cause serious miscarriage or preterm delivery.
It is recommended that pregnant women with low thyroid stimulating hormone need to complete the relevant examinations and be treated under the guidance of a professional physician, rather than blindly using medication.