Hashimoto’s Thyroiditis is an autoimmune condition that not only affects thyroid hormone production but also has a significant impact on fertility.
This article explores its global and Indian prevalence, its effects on reproductive hormones, methods of diagnosis, available treatments, dietary supports, and what can happen if left untreated.
Prevalence of Hashimoto’s Thyroiditis and Infertility Worldwide
Hashimoto’s thyroiditis is the most common autoimmune thyroid disease, affecting an estimated 7.5% of adults globally.
Women with thyroid autoimmunity, including Hashimoto’s, face nearly a 20% risk of infertility or subfertility, underscoring its relevance in reproductive health.
Prevalence of Hashimoto’s Thyroiditis and Infertility in India
In India, hypothyroidism affects around 28% of infertile women, while infertility itself impacts roughly 3.5%-16.8% of Indian couples.
These figures highlight the importance of thyroid evaluation in reproductive health within the Indian population.
What is Hashimoto’s Thyroiditis
Hashimoto’s thyroiditis occurs when the immune system attacks the thyroid gland, leading to inflammation and reduced hormone production.
Early stages may present as subclinical hypothyroidism, with raised TSH but normal T3 and T4 levels. Over time, symptoms such as…
- Fatigue
- Weight gain
- Cold intolerance
- Constipation
- Mood changes
May develop.
What is meant by infertility
Infertility is defined as the inability to conceive after 12 months of regular unprotected intercourse.
Globally, 8-12% of couples are affected, while rates in India range from 3.5% to 16.8%.
Thyroid autoimmunity, particularly Hashimoto’s, is increasingly recognised as a contributing factor to female infertility.
How Hashimoto’s Thyroiditis Affects Infertility and Other Hormones
Even with normal thyroid hormone levels, thyroid autoantibodies can interfere with fertility. Elevated TSH levels are associated with poorer egg quality and reduced implantation rates.
Hashimoto’s also disrupts oestrogen, progesterone, SHBG, and prolactin balance, contributing to ovulatory dysfunction, impaired implantation, and a higher miscarriage risk.
How Can Hashimoto’s Thyroiditis Be Investigated
Diagnosis typically includes tests for TSH, Free T4, anti-thyroid peroxidase (TPOAb), and anti-thyroglobulin (TgAb) antibodies. Thyroid ultrasound may show a diffusely enlarged or hypoechoic gland.
Screening for thyroid function and antibodies is especially recommended in women experiencing subfertility or recurrent miscarriage.
What Are the Treatments for Infertility Due to Hashimoto’s Thyroiditis
Treatment often involves levothyroxine, particularly when TSH exceeds 2.5mU/L in women planning pregnancy or when thyroid antibodies are present.
Thyroid hormone replacement helps normalise TSH, restore ovulation, and improve endometrial receptivity.
Indian studies show up to 34% of women with subclinical hypothyroidism conceived following levothyroxine therapy.
Early intervention and regular follow-up are key to improving fertility outcomes
What are the consequences if Hashimoto’s Thyroiditis is left untreated
If left untreated, Hashimoto’s can progress to overt hypothyroidism, causing menstrual irregularities, anovulation, and infertility.
During pregnancy, it increases the risk of miscarriage, preterm birth, and impaired fetal brain development.
Chronic hypothyroidism may also contribute to……
- Cardiovascular disease
- Metabolic syndrome
- Depression
- Cognitive decline.
Are there any dietary interventions for Hashimoto’s Thyroiditis
Nutritional support can play a valuable role in managing Hashimoto’s. Selenium and vitamin D supplementation may be individualised.
Anti-inflammatory diets rich in colourful vegetables, omega-3 fatty acids, and antioxidants may help reduce autoimmune activity. Limiting gluten, processed foods, and excess iodine can also be beneficial.
Summary
Hashimoto’s Thyroiditis is not just a thyroid disorder, as it impacts reproductive health through hormonal imbalance and autoimmunity.
Worldwide, around 20% of infertile women have thyroid antibodies, and in India, nearly 28% of infertile women are hypothyroid.
Early detection, timely levothyroxine therapy, and supportive dietary and lifestyle changes can significantly enhance fertility and overall hormonal balance.
