Thyroid problems can affect fertility in both women and men. In women, an underactive or overactive thyroid may interfere with menstrual cycles and ovulation. In men, thyroid hormone imbalance may affect sperm health.

The good news is that many thyroid conditions can be managed with appropriate medical treatment. Identifying a thyroid problem during fertility evaluation can help couples understand their options.

How Does the Thyroid Affect Fertility?

The thyroid gland produces hormones that help regulate the body's metabolism and influence reproductive function.

An underactive thyroid, known as hypothyroidism, can cause irregular periods and interfere with ovulation. An overactive thyroid, called hyperthyroidism, may also affect menstrual regularity and reproductive health.

Untreated thyroid disorders can increase certain pregnancy risks, which is why thyroid function may be assessed when a woman is planning pregnancy or undergoing fertility treatment.

What Are the Signs of a Thyroid Problem?

Some symptoms that may occur with thyroid disorders include:

• Irregular or missed periods

• Unexplained weight changes

• Persistent tiredness

• Increased sensitivity to heat or cold

• Changes in heart rate

• Difficulty conceiving

These symptoms can occur for other reasons too. A medical assessment and blood tests are needed to determine whether the thyroid is responsible.

How Are Thyroid Problems Diagnosed?

A blood test measuring thyroid-stimulating hormone (TSH) is commonly used to assess thyroid function. Depending on the results and symptoms, a doctor may recommend additional tests, such as free T4 or thyroid antibody testing.

Thyroid testing may form part of a fertility assessment when a patient's history or symptoms suggest a possible thyroid problem. The need for testing depends on the individual clinical situation.

Can Treating a Thyroid Problem Improve Fertility?

Treating an underactive or overactive thyroid can help restore normal hormone levels and may improve menstrual regularity when the thyroid disorder is contributing to the problem.

Treatment depends on the type of thyroid condition and may involve medication and regular blood tests. Not every fertility problem is caused by the thyroid, so other factors may also need to be assessed if pregnancy does not occur.

Do not start or change thyroid medication without medical advice.

Why Is Thyroid Health Important During Pregnancy?

Thyroid hormones play an important role in pregnancy, including the early development of the baby's brain and nervous system.

Women with a known thyroid condition may need closer monitoring before and during pregnancy. Their doctor can adjust medication and arrange blood tests when necessary to keep thyroid levels within the recommended range.

If you are planning a pregnancy and have a thyroid disorder, discuss your treatment plan with your doctor before conception.

Can Thyroid Problems Affect Male Fertility?

Yes. Thyroid hormone imbalance may affect sperm count, sperm movement, sexual function and other aspects of reproductive health in some men.

If a couple is experiencing difficulty conceiving, both partners may need evaluation. Depending on the medical history, a doctor may recommend thyroid tests alongside semen analysis and other investigations.

Fertility Care at Vignesh Hospital & Guna Fertility Centre

Vignesh Hospital & Guna Fertility Centre in Lalgudi, Trichy, provides care in fertility, IVF, obstetrics and gynaecology, urology and men's health, building on more than 50 years of community healthcare.