What problems can occur if a pregnant woman has low thyroid-stimulating hormone (TSH)?

In general, low thyroid-stimulating hormone (TSH) levels in pregnant women may lead to problems such as irregular vaginal bleeding, impaired fetal development, and increased risk of miscarriage. A detailed analysis is as follows:

1. Irregular Vaginal Bleeding

Low TSH levels can result in unstable embryonic development, making irregular vaginal bleeding more likely during early pregnancy.

2. Impaired Fetal Development

If thyroid-stimulating hormone levels are not maintained within the normal range, it may negatively affect fetal neurological development, potentially leading to intellectual disability, cretinism, or developmental malformations.

3. Increased Risk of Miscarriage

Excessively low TSH levels can reduce estrogen secretion in the body, leading to poor appetite in pregnant women. When nutritional intake becomes unbalanced, it may fail to support normal intrauterine embryonic development, thereby increasing the risk of miscarriage.

When a pregnant woman is found to have low TSH levels, it is recommended to promptly undergo appropriate evaluations and receive corresponding treatment under medical supervision to prevent adverse outcomes.