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  • Breeanna Scott

How Your Thyroid Affects Your Fertility

Updated: Dec 7, 2022

If you are planning to conceive in the next 2 years, a thyroid check should be on your priority list!

And by thyroid check I mean not just TSH (which is probably all that your doctor has ordered).

We need to test your TSH, T3, T4 and thyroid antibodies as a minimum, to really get a good picture of what is going on. This test is of great value if there is suspicion of either an under or over active thyroid or autoimmune picture, and costs around $200. This test can be organised through a nutritionist, & independently of your GP.


The thyroid is a tiny gland at the base of your neck responsible producing hormones that control energy production, body temperature, metabolism, blood pressure and very importantly, the development of the foetus.

Both an underactive & overactive thyroid can affect fertility in the following ways:

  • Disruption of the menstrual cycle, especially making the luteal phase shorter

  • Interference with the release of an egg from the ovaries (ovulation)

  • Difficulties during fertilisation & the implantation of the egg

  • Increased risk of early miscarriage

  • Increased risk of premature birth


Symptoms of your thyroid may need to be investigated :

  • Difficulty losing weight or unexplained weight gain

  • Insomnia

  • Mood changes - depression, nervousness, irritability

  • Fatigue

  • Increased sensitivity to the cold or heat

  • Irregular heartbeat

  • Constipation or diarrhoea

  • Menstrual symptoms

  • Hair loss and thinning


What can affect your thyroid and its functions?

  • Toxin exposure (endocrine disrupting chemicals, pharmaceuticals, alcohol)

  • Fluoride (tap water, toothpastes)

  • Poor gut health & digestive issues

  • Plant based diets

  • Liver congestion

  • Under eating

  • Over exercising

  • Medications

  • Poor quality vitamins & supplements

  • Prescribing your own vitamins & supplements without correct guidance from your nutritionist

  • Gluten intolerance or coeliac disease

  • Nutrient deficiencies

  • Chronic stress


Your thyroid health can be supported and optimised using diet, lifestyle & nutritional supplements.


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