Medically reviewed on July 14, 2023 by Jordan Stachel, M.S., RDN, CPT. To give you technically accurate, evidence-based information, content published on the Everlywell blog is reviewed by credentialed professionals with expertise in medical and bioscience fields.
Table of contents
It’s common for people with female anatomies to develop thyroid disease as a result of hormonal imbalances caused by menopause, puberty, or pregnancy.  In fact, women and people assigned female at birth (AFAB) are more likely to develop thyroid issues during their lifetime, compared to people with male anatomies, for this reason. 
These hormonal changes can, unfortunately, impact the menstrual cycle, in addition to mood, weight, and temperature control.  Fortunately, healthcare providers can prescribe medication to restore balance to optimize your thyroid function. That said, does thyroid medication affect the menstrual cycle, too?
The short answer is that it can—typically by restoring hormone levels to regulate menstruation and ovulation.
The thyroid is a gland found in the neck. It releases hormones that regulate various functions of the endocrine system. Primarily, it controls metabolism and energy use, but it serves additional purposes, too.
Since the endocrine system is made up of various organs and glands—including the hypothalamus, pituitary gland, heart, pancreas, kidneys, ovaries, and testes—it significantly impacts the whole body. 
More specifically, the thyroid plays a role in the regulation of :
A thyroid condition can lead to an irregular menstrual cycle due to the hormone imbalance that often coincides. Part of this menstrual irregularity is due to the impact of a thyroid problem on fertility and reproductive health.
Let’s take a look at thyroid and fertility. The thyroid helps to initiate ovulation—the process of releasing an egg from the ovaries, which allows the egg to mature and travel through the fallopian tubes and can become fertilized. This process may become interrupted when thyroid dysfunction occurs, depending on the condition. 
There are two types of thyroid gland dysfunction:
So, what can you do if you’re experiencing thyroid issues and menstrual cycle irregularities?
Speak to a healthcare provider. They can order a blood test to measure your thyroid hormone levels and can help you to take the appropriate actions in terms of treatment and medication.
Your treatment plan will depend on your thyroid condition or dysfunction. For those with hyperthyroidism, anti-thyroid medications are typically prescribed. These may include :
These medications work to decelerate the production of thyroid hormones and can take effect within weeks. Accordingly, they can help reregulate the menstrual cycle to stimulate normal blood flow and regular ovulation. That said, stopping treatment can lead to a resurgence of symptoms. More permanent treatment options can include iodine treatment or surgical removal of the thyroid; however, these options can also lead to an underactive thyroid.
Beta-blockers may also prescribed, although they will only mitigate symptoms; they will not impact hormone production and therefore may not have an effect on the menstrual cycle. 
Those with hypothyroidism typically require the intervention of thyroid hormone replacement, which is available in four forms :
Similar to anti-thyroid medications, thyroid hormone replacements help balance thyroid hormone levels. They do this by supplementing the body with thyroid hormones. That said, an incorrect dosage can lead to hyperthyroidism, and regular monitoring of hormone levels by a healthcare provider is recommended. 
While a thyroid condition can lead to an irregular menstrual cycle, medication can help restore a cycle and balance hormones. When taken responsibly and at the correct dosage, thyroid medications will rarely, if ever, negatively impact your menstrual cycle.
That said, in the case of thyroid hormone replacements, it’s important to ensure that you’re not getting too much thyroid medication, which can tip the scales in the opposite direction. Similarly, thyroid removal or iodine treatment for hyperthyroidism can lead to decreased thyroid hormone levels, which can impact the menstrual cycle unfavorably. 
If you’re currently on thyroid medication or experiencing symptoms related to thyroid dysfunction, Everlywell provides an at-home Thyroid Test that can measure your current levels of thyroid hormones and thyroid antibodies.
With just a finger prick and a postage stamp, you can receive healthcare provider-reviewed test results and a digital consultation, if your results come back irregular. If you’re looking for more guidance, our online thyroid services can pair you with a licensed healthcare provider to meet with you to hear your concerns. These licensed healthcare providers can also provide you with prescriptions and additional resources so that you can better understand your condition.
Crack the code with Everlywell.