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Many women in perimenopause notice new symptoms, such as fatigue, weight changes, brain fog, and mood shifts. These symptoms can be part of the normal hormonal transition. But they can also be signs of a thyroid problem, especially hypothyroidism.
Because the symptoms overlap so much, it can be easy to miss what’s really going on. Understanding the connection between your thyroid function and the menopause transition can help you get the right diagnosis and feel better sooner.
Hypothyroidism happens when the thyroid gland, a butterfly-shaped structure in the front of your neck, does not make enough thyroid hormone.
The thyroid is a small gland in your neck that helps control how your body uses energy. It affects your metabolism, heart rate, temperature, and more. When thyroid hormone levels are low, many body systems slow down.
People with low thyroid hormone levels may experience:
These symptoms overlap with other conditions, including perimenopause. That’s why it’s important to test thyroid levels in people who have symptoms.
Thyroid dysfunction, particularly hypothyroidism, becomes more common with age, especially in women.
Here are some quick facts about hypothyroidism:
As many as 1 in 5 women over the age of 60 has an underactive thyroid.
This means that if you’re in perimenopause and feeling off, your thyroid is worth checking.
Perimenopause and hypothyroidism can look very similar, and the symptoms of one can worsen the other. Both affect hormones, energy levels, and metabolism.
Symptoms shared between both menopause and hypothyroidism include:
One member of ThisIsMenopause shared, “My body hurts, and I’m so tired and worn out, almost like I have run a marathon.”
Another asked, “Does anyone ever have brain fog? I’m almost 41, and now that I’m older, I forget more and more.”
A third ThisIsMenopause member shared, “I have increasing hair loss.”
Yes, it can. If you have both hypothyroidism and perimenopause, symptoms may feel stronger or harder to manage.
For example, fatigue may be more severe, weight gain may be more noticeable, or mood symptoms could be harder to control.
Because of this overlap, treating hypothyroidism can sometimes improve symptoms that seem like menopause.
It’s reasonable to bring up thyroid function tests to your doctor if:
Also, if your symptoms started suddenly or are getting worse, it’s worth checking your thyroid.
Diagnosis is done with blood tests.
The main test is thyroid-stimulating hormone (TSH). If TSH is high, it usually means the thyroid is underactive. Doctors may also check free T4 (thyroid hormone level) and thyroid antibodies.
This common form of hypothyroidism is when TSH is high, but thyroid hormone levels are still normal. Some people with this mild form may not need treatment right away, but their thyroid levels will likely be monitored over time.
The main treatment for hypothyroidism is thyroid hormone replacement. Most people with hypothyroidism take levothyroxine (a synthetic version of thyroid hormone).
This medication:
When taking levothyroxine, it may take a few weeks to feel better. Blood tests will be repeated to adjust the dosage. Treatment is typically lifelong.
If you have hypothyroidism, it can change how your menopause symptoms are treated.
It’s important to treat the thyroid first. Certain symptoms blamed on menopause may improve once low thyroid hormone levels are brought back to normal.
Thyroid conditions can affect treatment decisions about hormone therapy. Menopause hormone therapy, also called hormone replacement therapy (HRT), can still be a safe and effective treatment for menopause symptoms for many people with hypothyroidism.
Your provider will likely try to correct your thyroid levels and reassess symptoms before adding treatment for menopause symptoms.
Estrogen levels can affect how the body uses thyroid hormone. Whether your estrogen levels are dropping during menopause or you’re starting estrogen therapy, your dose of thyroid hormone replacement therapy may need to be adjusted more often at first.
When dosing thyroid treatment, weight changes matter. Weight gain or loss can affect how much medication you need.
Bone health is also important to consider with hypothyroidism and menopause. Both menopause and thyroid issues can affect bones.
An overactive thyroid, or overtreatment with too much thyroid hormone, can increase bone loss. Ask your doctor about how to avoid osteoporosis and protect your bone health.
Because symptoms overlap, it’s important to monitor how you feel and follow up regularly with your doctor.
Helpful strategies include:
Lifestyle steps like healthy eating and movement can help with both weight changes and energy levels.
Perimenopause and hypothyroidism can feel very similar, and they often happen around the same time. If something feels off or more intense than expected, it’s reasonable to ask about thyroid testing. A simple blood test can help clarify what’s going on.
Getting the right diagnosis matters. Treating hypothyroidism can improve symptoms, support your overall health, and may make the menopause transition easier to manage.
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