Can Hypothyroidism Cause Anxiety? Symptoms, Causes, and Relief

Key Takeaways

• Hypothyroidism can contribute to anxiety by altering your brain chemistry, disrupting sleep, and affecting how your body regulates stress.
• Symptoms like fatigue, irritability, heart palpitations, and restlessness overlap significantly with anxiety, making an accurate diagnosis important.
• Blood tests measuring TSH, free T4, and thyroid antibodies are the standard way to evaluate thyroid function.
• Thyroid hormone therapy often helps ease anxiety as levels stabilize, though it can take several weeks to feel the full effect.
• If anxiety persists despite optimized thyroid treatment, additional support through therapy or medication can make a meaningful difference.
• Hypothyroidism is more common in women and becomes increasingly prevalent with age—advocating for thyroid testing is always worthwhile.

The short answer is yes—hypothyroidism can contribute to anxiety, and for many people, it does.

Low thyroid hormone alters brain chemistry, disrupts sleep, and affects how your body manages stress. The result can be persistent worry, restlessness, or a vague sense of unease that’s difficult to explain, and even harder to connect to your thyroid without the right information.

Anxiety and hypothyroidism also share enough overlapping symptoms that it’s easy to miss the connection, or to treat one without addressing the other. If you’re experiencing mood changes alongside fatigue, brain fog, or unexplained weight gain, speaking with a mental healthcare provider can help clarify what’s driving your symptoms and where to start.

Let’s break down how thyroid hormones influence mood, what thyroid-related anxiety looks like, and how treatment (both medical and lifestyle-based) can help.

What is hypothyroidism?

The thyroid gland is a small, butterfly-shaped gland at the front of your neck that produces hormones controlling how your body uses energy. When it doesn’t produce enough, the condition is called hypothyroidism.

Hypothyroidism is more common than many people realize, with higher rates in women and older adults. Hashimoto’s thyroiditis (an autoimmune disease in which the immune system attacks thyroid tissue) is the most common cause in the US.

Symptoms often develop gradually, which is part of why hypothyroidism can go undetected for a long time. You might notice:

• Fatigue and low energy
• Weight gain
• Dry skin or hair loss
• Feeling cold when others aren’t
• Constipation
• Brain fog or difficulty concentrating

Because these symptoms overlap with so many other conditions, hypothyroidism is sometimes missed. Mood changes (including both depression and anxiety) are also part of the picture. Research suggests that people with hypothyroidism experience anxiety symptoms at higher rates than those with normal thyroid function, which makes sense given how broadly thyroid hormone influences the body, including the brain.

How thyroid hormones affect mood

Thyroid hormone acts like a thermostat for your metabolism: it tells cells how fast to work, and that includes brain cells. When levels drop, brain chemistry shifts in ways that can meaningfully affect how you feel.

Two neurotransmitters central to mood regulation—serotonin and norepinephrine—can be affected by low thyroid hormone. When their activity decreases, you may experience sadness, irritability, or nervousness. Many people describe it as feeling “off” without being able to pinpoint why.

Energy regulation plays a role as well. An underactive thyroid slows your body’s baseline functions, which can leave you exhausted even after a full night of sleep. Chronic fatigue has a cumulative impact on mental health… When you’re consistently depleted, small stressors feel larger, and your capacity to cope shrinks.

Heart rate and stress tolerance are also affected. Hypothyroidism can slow the heart, but during hormone fluctuations or medication adjustments, some people experience the opposite: palpitations and a racing pulse. These physical sensations can trigger or amplify anxiety, creating a feedback loop that’s difficult to break without addressing the root cause.

Sleep disruption adds another layer. Hypothyroidism can contribute to sleep apnea or restless sleep, and since poor sleep is a known risk factor for both anxiety and depression, when thyroid function suffers, mood often follows.

Common anxiety symptoms in hypothyroidism

Anxiety doesn’t look the same for everyone. When it comes to hypothyroidism and anxiety, symptoms often overlap with the physical effects of low thyroid hormone, which can make it genuinely difficult to sort out what’s driving what.

Fatigue, irritability, and sweating

Fatigue is the hallmark symptom of hypothyroidism, but it often pairs with irritability. When your body is running low on fuel, patience tends to run short… Small frustrations can feel outsized, and that emotional reactivity can closely resemble anxiety, especially when it comes with muscle tension or restlessness.

Sweating is less common in hypothyroidism than in hyperthyroidism (an overactive thyroid), but some people do notice it, particularly during anxious episodes, hormone fluctuations, or periods of poor sleep.

The combination of exhaustion and edginess is particularly disorienting. You’re tired but can’t relax. You want to rest but feel agitated. This pattern is worth noting and discussing with a provider, as it can point to something systemic, like thyroid dysfunction, rather than stress or lifestyle alone.

Heart palpitations and nervousness

Palpitations are more commonly associated with hyperthyroidism, but they can occur with hypothyroidism too, particularly during medication adjustments or when hormone levels are fluctuating.

A racing or pounding heart activates the body’s alarm system, and the nervousness that follows can become self-reinforcing if it happens repeatedly. Some people notice palpitations when first starting thyroid medication. As hormone levels normalize, these sensations typically ease. Working with a provider to adjust dosing gradually can help minimize this and reduce medication-related anxiety.

Why your mood changes with thyroid dysfunction

A thyroid disorder can affect your mood through a few different interconnected pathways, which is part of why the experience can feel so hard to untangle.

There’s the direct hormonal effect: thyroid hormone crosses the blood-brain barrier and influences how brain cells function. Low levels can slow neural activity, dampen mood, and increase anxiety. The brain depends on a steady hormone supply to regulate emotions effectively.

Hypothyroidism also changes how your body handles stress. The adrenal glands and thyroid work together within the endocrine system: when one is off balance, it can affect the other. Cortisol, the primary stress hormone, may become dysregulated, which is associated with anxiety, disrupted sleep, and difficulty concentrating.

Then there’s the emotional weight of managing a chronic condition. Living with persistent fatigue, weight changes, and brain fog takes a real toll. The stress of navigating long-running, sometimes invisible symptoms can trigger or worsen anxiety, even when the underlying hormone imbalance is being treated.

Finally, the symptom overlap between thyroid disease and anxiety disorders makes accurate diagnosis essential. Nervousness, irritability, palpitations, and sleep disruption appear in both. Identifying whether anxiety is primarily related to thyroid imbalance, or is a separate condition, helps ensure you get the right support.

If anxiety is a concern, Nurx can connect you with licensed providers for an online mental health evaluation and, if appropriate, prescribe evidence-based anti-anxiety treatment to help you manage symptoms.

How to know if your anxiety is thyroid-related

Understanding the source of your anxiety matters, because treatment differs depending on the cause. Anxiety linked to hypothyroidism often improves with proper thyroid management. A primary anxiety disorder may require a different approach, sometimes alongside thyroid care.

Tests to check thyroid function

Blood tests are the standard way to evaluate thyroid health. TSH (thyroid-stimulating hormone) is typically checked first: an elevated TSH suggests hypothyroidism, because the pituitary gland is working harder to stimulate an underproductive thyroid.

Free T4 measures the active thyroid hormone circulating in your blood. Low free T4 alongside high TSH confirms hypothyroidism. Some providers also check free T3, particularly when symptoms persist despite normal TSH and T4 results.

Thyroid antibodies, including TPO and thyroglobulin antibodies, help identify autoimmune causes like Hashimoto’s thyroiditis. Knowing the underlying cause can guide long-term management and help predict how the condition may progress.

When to consider a primary anxiety condition

Not all anxiety traces back to the thyroid. If your thyroid levels are normal and stable but anxiety persists, a primary anxiety disorder (such as generalized anxiety disorder, panic disorder, or social anxiety) may be the cause.

Signs that point toward a primary anxiety condition include worry that predates thyroid symptoms, anxiety that doesn’t respond to optimized thyroid treatment, and triggers or patterns unrelated to physical symptoms. A mental health provider can help sort this out through careful evaluation.

The encouraging part is that both thyroid-related and primary anxiety respond well to treatment—and often, the most effective approach combines medical and therapeutic care. Connecting with a provider who can assess both sides of the picture is one of the most valuable things you can do. 

Treating anxiety linked to an underactive thyroid

For anxiety driven by hypothyroidism, the most important step is addressing the root cause: normalizing thyroid hormone levels. For most people, this means daily thyroid hormone replacement therapy. As levels stabilize, anxiety often improves alongside other symptoms.

Adjusting thyroid medication

Levothyroxine (Synthroid®, Levoxyl®, Tirosint®) is the standard treatment for hypothyroidism: a synthetic thyroid hormone that replaces what your body isn’t producing adequately.

Dosing is based on body weight, age, and lab results. Starting at a lower dose and increasing gradually reduces the risk of side effects like palpitations or jitteriness. Your provider will typically recheck TSH and free T4 about six to eight weeks after any dose change.

For some people whose symptoms persist despite normal T4 levels, adding liothyronine (Cytomel®), a T3 medication, may be worth discussing. This isn’t the right approach for everyone, but it’s worth raising with your provider if levothyroxine alone isn’t fully resolving your symptoms.

Lifestyle changes for better mood

Medication is the foundation, but daily habits meaningfully support both thyroid and mental health. Consider these evidence-backed strategies:

• Prioritize sleep: Aim for 7–9 hours on a consistent schedule, even on weekends. Poor sleep can worsen hypothyroidism symptoms and amplify anxiety.

• Move gently and regularly: Walking, swimming, yoga, or other low-impact activities help regulate mood and energy without overtaxing your body.

• Support thyroid-friendly nutrition: Include foods rich in iodine and selenium—like Brazil nuts, fish, and eggs—to support thyroid function. Avoid high-dose iodine supplements unless advised by your provider.

• Check for nutrient gaps: Vitamin D, B12, magnesium, and omega-3s are often low in people with hypothyroidism. Discuss supplementation with a healthcare provider before adding anything, especially herbal products like ashwagandha, which can affect thyroid hormone levels.

• Limit caffeine and alcohol: Both can disrupt sleep and intensify anxiety. Heavy reliance on caffeine may signal a need to review your thyroid treatment plan.

• Mind your mental health: Cognitive behavioral therapy (CBT) and mindfulness practices are effective tools for managing anxiety, whether thyroid-related or not.*

*Nurx doesn’t provide talk therapy or crisis management, but we have an extensive list of mental health resources to help you along this part of your journey.

For anxiety that needs additional medical support, options your provider may consider include sertraline (generic Zoloft®), escitalopram (generic Lexapro®), venlafaxine (generic Effexor XR®), buspirone (generic Buspar®), or hydroxyzine (generic Vistaril®), depending on your full history and current treatment plan.

When to reach out for more support

Lifestyle changes and thyroid treatment make a real difference for many people—but if anxiety isn’t improving, that’s a meaningful signal worth acting on.

Consider reaching out if anxiety is affecting your work, your relationships, or your ability to move through daily life. If you’re avoiding situations because of worry, or if panic attacks are occurring, professional support can help significantly.

A mental health provider can offer therapy, medication, or a combination of both. When your mental health care and thyroid management are in conversation with each other, outcomes tend to be better. Our mental health resources page is a helpful starting point if you’re looking for that kind of support.

Feeling better starts with the right answers

Can hypothyroidism cause anxiety? Yes—and it’s more common than many people realize.

Low thyroid hormone affects brain chemistry, energy regulation, and stress tolerance in ways that can trigger or worsen anxious feelings. The overlap between thyroid symptoms and anxiety makes accurate evaluation essential.

Testing TSH, free T4, and thyroid antibodies gives you and your provider a clear picture to work from. Thyroid hormone therapy often helps ease anxiety as levels normalize, while consistent sleep, nutrition, movement, and stress management strengthen the foundation over time.

When anxiety persists despite optimized thyroid treatment, additional support through therapy or medication can make a real difference, and you don’t have to wait until things feel unmanageable to ask for it. 

Frequently Asked Questions (FAQ):

What foods should you avoid if you have hypothyroidism?

You generally don’t need to eliminate specific foods entirely, but a few things are worth knowing. Large amounts of raw cruciferous vegetables, like cabbage, broccoli, and kale, may interfere with thyroid hormone production if iodine intake is already low. Soy can affect medication absorption if consumed close to your dose. High-fiber foods, calcium, and iron supplements are best kept away from your thyroid medication window. Rather than making broad dietary restrictions, talk with your provider about what adjustments make sense for your specific situation.

What does hypothyroid anxiety feel like?

It can feel like persistent worry, low-grade nervousness, irritability, restlessness, or a sense of being “on edge”, often alongside physical symptoms like a racing heart, muscle tension, or difficulty concentrating. Many people also notice it’s intertwined with fatigue and sleep disruption, which can make the whole experience harder to shake.

Do people with hypothyroidism need more sleep?

Many people with hypothyroidism feel like they need more sleep because the condition can cause significant fatigue and daytime sleepiness. That said, consistently needing much more sleep than usual (especially when it’s not helping you feel rested) can also signal that thyroid levels or your current treatment may need to be reassessed. It’s worth tracking and bringing up with your provider.

What are the most disruptive symptoms of hypothyroidism?

The symptoms that tend to have the greatest impact on daily life include severe fatigue, weight gain, depression or low mood, brain fog, sensitivity to cold, constipation, dry skin, hair changes, and heavy or irregular periods. In rare, severe, untreated cases, hypothyroidism can lead to serious complications, which is one reason getting tested and starting treatment early matters.

The information provided is not a substitute for professional medical advice, diagnosis, or treatment. You should not rely upon this content for medical advice. If you have any questions or concerns, please talk to a medical professional. Nurx does not provide talk therapy or crisis management. If you’re experiencing a mental health crisis, please call 911 or go to your nearest emergency department.

Services not offered in every state. Medications prescribed only if clinically appropriate, based on completion of the required consultation. Individual results may vary.

Buspirone HCl tablets (5mg, 7.5mg, 10mg, 15mg, & 30mg), Rx only, treats anxiety disorder. Buspirone HCl may also cause side effects including but not limited to dizziness, drowsiness, nausea. If you would like to learn more, see full prescribing information, here.

Escitalopram tablets (5mg, 10mg, & 20mg), Rx only, treats major depressive disorder. Escitalopram may cause side effects including but not limited to nausea, diarrhea, fatigue, headache, sexual problems, sleep problems. If you would like to learn more, see full prescribing information, here.

Hydroxyzine HCL (10mg) and Hydroxyzine pamoate (25mg), Rx only, treats anxiety. This drug may cause side effects, including but not limited to drowsiness, dizziness, dry mouth. If you would like to learn more, see full prescribing information, here.

Sertraline HCl tablets (25mg, 50mg, 100mg), Rx only, treats depression, panic disorder, social anxiety disorder, post-traumatic stress disorder (PTSD), premenstrual dysphoric disorder (PMDD), and obsessive compulsive disorder (OCD. This drug may cause side effects, including but not limited to diarrhea, nausea, dry mouth, dizziness, drowsiness, fatigue, sleep problems, sexual problems. If you would like to learn more, see full prescribing information, here. 

Venlafaxine HCl ER capsules (37.5mg, 75mg, 150mg), Rx only, treats depression and anxiety. This drug may cause side effects, including but not limited to dizziness, drowsiness, insomnia, dry mouth, sweating, decreased appetite. If you would like to learn more, see full prescribing information, here. 

Not all options discussed in the blog are available through Nurx. Please see Nurx.com for details. All product names, manufacturer or distributor names, logos, trademarks, and registered marks (“Product Marks”) are the property of their owners and are for identification purposes only. Product Marks do not imply any affiliation, endorsement, connection, or sponsorship by their owner(s) with Nurx.