How Your Thyroid Can Cause Period Problems

Along with many of the other symptoms of hypothyroidism, menstrual issues is a common one. Thyroid hormone is needed for pretty much every function and cell in the body so when you’re hypothyroid, many processes — including your menstrual cycle — can be affected. 

The direct link between thyroid disease and menstrual cycles is not well understood by many medical professionals just yet, but there are certain patterns we know to be true, going by many patients’ experiences and symptoms.

Heavy Periods

Undiagnosed hypothyroidism or below optimal treatment for the condition is associated with a variety of menstrual issues. One of these is heavy periods, also called ‘menorrhagia‘, a term I was given and diagnosed with at sixteen years old when I went to the doctors for the first time ever, complaining of my period only getting heavier each month, since I started them at twelve years old. Heavy periods or Menorrhagia is defined as excessively heavy or prolonged menstrual bleeding, such as soaking through a sanitary pad every hour for several hours or more, passing large blood clots (hypothyroidism and blood clots during periods are common) or your period lasting longer than five days, which is seen as the average duration of a period. And even if you think a ten day long period is normal, like I did for years, I promise you it’s not.

A photo of Rachel's feet dangling over the edge of a wall facing into a harbour. An old wooden ship is pulling in over cloudy skies.

My periods were lasting for ten days, if not longer, and I was leaking through the heaviest pads I could find, every half an hour. I’d miss days off school or have to come home to change, every time I was on. I dreaded my period and regularly avoided leaving the house where I could. For me now, looking back, it was a bit of a warning sign for my impending hypothyroidism. I suspect I’ve always had hormonal issues and imbalances, namely oestrogren dominance, which likely contributed to me triggering Hashimoto’s and thus, my hypothyroidism.

Painful Periods

With the heavy and long periods, I also experienced dysmenorrhea, particularly painful periods. Some discomfort is expected when your body is shedding itself from the inside, sure, but pain that leads to you taking time off work or school isn’t normal. This commonly includes backache, headache and those famous stomach cramps (period pains). If yours are excessive or have you curled over in pain, they may well be caused by your thyroid problem.

Irregular Periods 

Irregular or sporadic periods, e.g. going a month between having one and then two months before another and three weeks before another, can also be a symptom of hypothyroidism and so can ‘Amenorrhea’, when periods stop altogether. Amenorrhea can also be a sign of hyperthyroidism, so it’s definitely worth having a full thyroid panel ran to get a good insight into what’s going on. If you have irregular or sporadic periods, like me, this can be really frustrating and even anxiety inducing. As well as a full thyroid panel, I would suggest looking into your salivary cortisol levels and checking for adrenal dysfunction (adrenal fatigue). High cortisol levels can rob your body of progesterone, causing an imbalance known as oestrogen dominance, and this can cause a myriad of problems, such as irregular periods or periods that disappear for two or three months, or simply become so irregular that you’re not sure when to expect them. This happened to me. And adrenal fatigue is extremely common among thyroid patients.

Short Cycles 

Hypothyroidism and adrenals issues can also cause periods to come knocking more often than normal, a condition known as ‘Polymenorrhea‘. With this, you find that your period comes more frequently than it should, every twenty-one days for example, instead of the average twenty-eight day cycle. A sex hormone imbalance such as low progesterone and too much oestrogen, common with hypothyroidism and adrenal dysfunction, is believed to be at fault, as your low progesterone level means the luteal phase can’t be sustained for long enough, so it’s cut short, bringing on your period sooner and harming chances of falling pregnant. More on that below.

Delayed Periods 

Something else to mention, any teenage girls who are yet to start their period and are approaching their late teens, should be  tested for a potential thyroid problem, as it could be the reason for delayed menstruation.

Fertility 

In terms of fertility, hypothyroidism can also get involved there. 

Thyroid hormones directly affect the uterine lining, causing infertility or miscarriages to occur when they are abnormal. As well as complications during pregnancy, some women with low thyroid levels may even struggle to fall pregnant at all.

Hormones TSH (thyroid stimulating hormone) and TRH (thyrotropin-releasing hormone) are ramped up when thyroid hormones such as Free T3 and Free T4 fall too low; TRH to stimulate the pituitary gland to release TSH, which then instructs the thyroid gland to release more thyroid hormones T3 and T4. Infertility can therefore occur when TRH, which is also responsible for stimulating the pituitary gland to release prolactin, causes the increased prolactin to interfere with the ovulation process, when thyroid hormones are low. The increased prolactin levels (prolactin is also important for promoting lactation) can prevent the ovaries from releasing an egg each month, which makes it more difficult to conceive. Therefore, ensuring your thyroid levels, TSH, Free T3 and Free T4, are all optimal is crucial when trying to conceive.

Hypothyroidism may also cause a short luteal phase which can affect fertility. The luteal phase is the time between ovulation (the release of an egg) and the start of your period, if you don’t fall pregnant. In order to become successfully pregnant, your body needs to be in its luteal phase for around fourteen days, to allow a fertilised egg enough time to successfully implant and start to develop. If your luteal phase is too short, a successfully fertilised egg may not have the chance to implant and so becomes removed from the body during your period. Thus affecting the ability to fall pregnant.

So, what can you do?

I hear from a lot of thyroid patients who complain that changes to their periods or menstrual cycle only started after commencing thyroid medication – and so they believe that the medication is the culprit for these changes. However, thyroid medication itself won’t cause changes to your period, but instead it often brings to the surface other hormonal issues you may have going on, such as a sex hormone imbalance or adrenal fatigue. Both of which can cause period changes a long with less than optimal thyroid hormone levels.

So with any menstrual issues or abnormalities, a full thyroid panel testing Free T3, Free T4, TSH and thyroid antibodies should be run, with Reverse T3 also important if possible, but also a 24 hour saliva test for cortisol (adrenals) and blood test for sex hormones. You should test your progesterone at its peak, around day 21 of your cycle (this may differ or be difficult to predict if you have an irregular cycle), and oestrogen Days 3-5. Testosterone can be tested at anytime during the month and checking FSH (the ovarian  egg supply) can also be beneficial.

Behind any period issues or abnormalities/changes, there is likely non-optimal thyroid levels, oestrogen dominance and/or adrenal fatigue.

Do ensure your thyroid levels are optimal as an initial step. Many of the problems mentioned in this post can be solved with optimal thyroid levels.

You can click on the hyperlinks in the above post to learn more and see references to information given but more information can also be found at:

https://www.theinvisiblehypothyroidism.com/2017/11/14/oestrogen-dominance-and-hypothyroidism/ 

https://www.verywell.com/menstrual-problems-and-thyroid-disease-3231765

https://www.larabriden.com/irregular-periods-think-about-thyroid/

https://www.healthcentral.com/article/how-your-thyroid-affects-your-menstrual-period

https://www.ncbi.nlm.nih.gov/pubmed/9238278

https://www.theinvisiblehypothyroidism.com/2017/04/25/fertility-with-hypothyroidism/

https://www.drnorthrup.com/estrogen-dominance/

If you found this article helpful please take a moment to share this post on social media so we can help other Thyroid Warriors get better and spread awareness.

Written by Rachel, The Invisible Hypothyroidism

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Rachel is a Thyroid Patient Advocate and Expert with Six 2018 WEGO Health Award Nominations. She is a highly ranked writer appearing in the Top Hypothyroidism Websites and Top Thyroid Websites 2018, and is a qualified Diet and Nutritional Advisor, also currently studying for relevant qualifications and certificates in Life Coaching, Motivational Speaking, Reflexology and more. She has worked with The National Academy of Hypothyroidism, The BBC, The Mighty, Dr. Hedberg, Thyroid UK and ThyroidChange, to name just a few. She is well recognised as a trusted and useful contributor to the thyroid community.

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