Subclinical hypothyroidism

Hypothyroidism (hypothyroidism, referred to as hypothyroidism) is a group of endocrine diseases caused by insufficient thyroid hormone (TH) synthesis, secretion, or biological effects caused by multiple reasons. Only the level of serum thyroid stimulating hormone (TSH) is slightly elevated, while the level of serum thyroid hormone (FT4, FT3) is normal, the patient has no hypothyroidism or only mild hypothyroidism, which is called subclinical hypothyroidism (referred to as subclinical hypothyroidism), also known as mild hypothyroidism, latency hypothyroidism, biochemical hypothyroidism, and reduced thyroid reserve.