Thyroid Disease

Did you know that approximately 1 to 4% of all adolescents and adults are affected by a dysfunctional thyroid gland, usually referred to as thyroid disease?

Did you know that thyroid disease can be a cause of conception difficulties and early miscarriage?

Did you know that it's estimated far more people have thyroid disease than are aware of that fact?

If you're searching for explanations for your infertility or recurrent miscarriage, here are some facts to consider about thyroid disease:

What is a thyroid gland?

A gland of located in the base of the neck on both sides of the lower part of the larynx and upper part of the trachea. In some cases of thyroid disease, the gland becomes noticeably enlarged. Important to body's metabolism by converting thyroglobulin (a protein) into thyroxines after the gland is stimulated by TSH from the pituitary gland.

TSH levels

Normal = .5 to 5.5; However, many reproductive endocrinologists believe that a low normal reading of this test is best for enhancing conception.

Thyroid (antithyroid) antibodies

Presence of these antibodies (measured through a simple blood test) usually indicates a gland that is starting to fail; can affect implantation of an early conceptus, thereby leading to very early miscarriage.


medical term meaning your TSH level is in the normal range, so you're neither hyperthyroid or hypothyroid, yet you have symptoms of the disease.

How does thyroid disease affect fertility?

In women

  • may cause anovulation & menstrual irregularities
  • may cause luteal phase defect (LPD)
  • may cause hyperprolactinemia

In men

  • may cause low sperm count
  • may reduce sperm motility (movement)