What are the effects of low thyroid stimulating hormone on the fetus?

Low thyroid-stimulating hormone is a common phenomenon in daily life, and it is very harmful to human health. But what impact does low thyroid-stimulating hormone have on the fetus? Many expectant mothers don’t fully understand this. In fact, low thyroid-stimulating hormone can cause fetal maldevelopment, premature birth and other conditions, so expectant mothers must pay attention.

1. Effects of low thyroid stimulating hormone on the fetus

It is prone to fetal maldevelopment, premature birth, miscarriage, fetal maldevelopment and stillbirth.

2. What causes low thyroid stimulating hormone during pregnancy?

Expectant mothers may be unfamiliar with thyroid-stimulating hormone before, but they are very familiar with the word thyroid. The thyroid gland is an important endocrine organ in the human body. The thyroid hormone it secretes can promote tissue metabolism and development, and also plays an important role in increasing the excitability of the nervous system. Thyroid hormone is regulated by thyroid-stimulating hormone.

Under normal circumstances, thyroid-stimulating hormone can stimulate the thyroid gland to secrete thyroxine. When the thyroid hormone level in the body increases, it can inhibit the secretion of thyroid-stimulating hormone through a "negative feedback" mechanism, thereby lowering the thyroid hormone level and ensuring normal thyroid hormone levels in the body. Too much or too little TSH in the body can cause serious illness.

After a woman becomes pregnant, her body's endocrine system undergoes many adjustments to adapt to the needs of pregnancy, including thyroid hormone. Affected by the sharply increased HCG levels in early pregnancy, the activity of the thyroid gland will also increase accordingly, resulting in an increased trend in thyroid hormone levels in pregnant women. At this time, the "negative feedback" mechanism of thyroid hormone will come into play to inhibit the secretion of thyroid stimulating hormone, thereby maintaining the balance of thyroid hormone levels in the body.

This is why there is a downward arrow (low) on the thyroid-stimulating hormone item on the checkup report that expectant mothers receive in early pregnancy. This phenomenon is very normal. Generally, TSH levels will return to normal in the second and third trimesters of pregnancy.

However, if the thyroid hormone in the pregnant woman's body increases due to illness, the thyroid-stimulating hormone will decrease instead. At this time, the most feared thing is that the pregnant woman will develop hyperthyroidism during pregnancy. If not treated properly, it may cause pregnant women to have heart failure, preeclampsia, thyroid crisis, miscarriage, premature birth, low birth weight and other diseases. However, hyperthyroidism during pregnancy cannot be diagnosed based on low thyroid-stimulating hormone alone. A comprehensive diagnosis requires other examinations and tests.