Hypothyroidism is the most prevalent thyroid condition associated with pregnancy, affecting 3-5% of all pregnant women. The thyroid-stimulating hormone (TSH) density larger than the reference interval prescribed for pregnancy for each experimental level, or TSH concentration levels larger than 2 to 6 mIU/L in the first trimester and larger than 2 mIU/L in the consecutive trimesters, is typically considered to be subclinical hypothyroidism, that is higher prevalent than overt hypothyroidism. Although this is not the generally recognized definition, some researchers have said that overt hypothyroidism is characterized by a serum TSH greater than 11 mIU/L and subclinical hypothyroidism as a serum TSH between 6 and 10 mIU/L. As soon as overt hypothyroidism is identified, levothyroxine therapy should quickly bring blood TSH concentration into the reference limits for pregnancy. Different professional organizations have different recommendations for treatment for people with subclinical hypothyroidism due to conflicting information from observational research and clinical trials addressing the advantages for the mothers or the kid. Similarly, widespread monitoring and diagnosing of all pregnant ladies for subclinical purposes is recommended because the advantages of treatments are still unknown. Additionally, more than 55% of women with originally diagnosed hypothyroidism need to take more levothyroxine throughout gestation. This might be solved by improving and enhancing the levothyroxine prescription on the confirmation of pregnancy.