Hypothyroidism and Fertility: Why Your Thyroid Matters Before You Conceive
Even mild thyroid dysfunction can disrupt ovulation and increase miscarriage risk. Learn target TSH levels, treatment options, and when to see a fertility specialist.
What is hypothyroidism?
Hypothyroidism occurs when the thyroid gland produces insufficient thyroid hormones. These hormones regulate metabolism, reproductive function, and hormone signaling. Even mild thyroid dysfunction can negatively affect fertility and pregnancy outcomes.
Symptoms to watch for
- Fatigue and weight gain
- Cold intolerance, dry skin, hair loss
- Depression
- Heavy or irregular menstrual bleeding
- Difficulty conceiving
Common causes include Hashimoto's thyroiditis, autoimmune disease, thyroid surgery, radiation exposure, iodine deficiency, and family history.
Diagnosis & fertility targets
Tests include TSH, Free T4, Free T3, and thyroid antibodies (TPO-Ab). For women trying to conceive, many fertility specialists aim for a TSH below 2.5 mIU/L.
Low thyroid hormone levels may prevent normal ovulation, increase miscarriage risk, affect implantation, and cause menstrual irregularities.
Treatment pathway
- Thyroid hormone replacement — restores normal function; high improvement in fertility (₹500–3,000/month)
- Ovulation monitoring — confirms return of ovulation (₹3,000–10,000)
- IUI — useful after hormonal stabilization; 10–18% per cycle (₹10,000–25,000)
- IVF — when additional infertility factors exist; 40–60% (₹1.5L–3L)
Many women conceive naturally once thyroid levels normalize. Thyroid optimization is often the essential first step.