Thyroid gland, previously supposed not to have any impact on spermatogenesis and male fertility, are now being recognized as having important role in male reproductive functions. Most of the studies on the effect of thyroid hormones on male fertility were conducted between the years and 1. The effects of thyroid hormone alterations on the reproductive system have been studied extensively in human subjects and animal models that have generally shown that changes from normal thyroid function resulted in decreased sexual activity and fertility 2 , 3. The underlying mechanisms, however, are not constant throughout all species, and results from different studies disagree 4. In rats rendered thyrotoxic by T4 resulted in decreased serum gonadotropin levels 5 , decrease in total lipids, cholesterol, and phospholipids in testes, and synthesize increased amounts of testosterone 6.
Underactive thyroid and male reproductive health
Thyroid Disorders and Semen Quality | Biomedical and Pharmacology Journal
When a couple decides that it's the right time to have a child, anything that delays conception can cause distress. When the problem is due to infertility in the male, the direct cause may not always be a malfunction in his reproductive organs. Other conditions, such as hypothyroidism, could be the root cause of the problem. In many cases, correcting this disorder can restore a man's fertility.
Sperm abnormalities: Adverse effects of thyroid dysfunction
Undiagnosed thyroid dysfunction can make it difficult to conceive. It can also cause problems during pregnancy itself. Once the over- or under-active thyroid is under control, however, there is no reason why you should not have a successful pregnancy and a healthy baby. If it is untreated you may have lighter, irregular periods and find it difficult to conceive.
Thyroid disease in men involves many of the same symptoms as those that affect women with a thyroid disorder. Men, however, may also experience some manifestations of a thyroid issue that are unique to their sex—some of which you may not immediate associate with such a concern, such as low sperm count, loss of muscle mass, and erectile dysfunction. Many men don't consider that they could have thyroid disease, even if they present with classic symptoms.