Yes, thyroid problems can cause anxiety, low mood and symptoms that resemble depression. An overactive thyroid can increase nervousness, while an underactive thyroid can affect energy, concentration and mood.
Your GP may recommend a thyroid blood test if mood changes occur alongside physical symptoms. However, thyroid problems do not explain every case of anxiety or depression. Some people also need mental health support after their thyroid levels improve.
Here are the key points to understand:
- Overactive thyroid
- Underactive thyroid
- TSH test
- Research evidence
- Combined care
How Thyroid Hormones Affect Mood, Energy and Anxiety
Your thyroid is a small, butterfly-shaped gland at the front of your neck. It produces hormones that help regulate your metabolism, heart rate and body temperature.
These hormones also influence the brain, sleep and energy levels. When your thyroid produces too much hormone, your body may feel as though it constantly runs at high speed. You might feel restless, shaky or unusually alert.
When your thyroid produces too little hormone, everyday activities may feel harder. You might struggle with fatigue, concentration, or motivation.
When your thyroid produces too little hormone, your brain, sleep, and energy levels may suffer. When your thyroid produces too much hormone, your body may feel as though it constantly runs at high speed. You might feel restless, shaky, or unusually alert.
These physical changes can affect your emotional wellbeing. They may trigger anxiety or contribute to low mood, especially when symptoms disrupt sleep and daily routines.
However, mood symptoms have many possible causes. Stress, medication, other health conditions, and mental health disorders can also affect how you feel. A thyroid test helps your GP investigate one possible cause, rather than explain every symptom.
Can Hyperthyroidism Cause Anxiety and Panic Attacks?
Yes. Hyperthyroidism means your thyroid produces too much hormone, which can increase nervousness, physical agitation, and heart rate. These changes can feel similar to anxiety or panic attacks. Graves’ disease is the most common cause of hyperthyroidism in Australia.
Blood tests help your GP determine whether your thyroid is contributing to your symptoms.
You may notice several changes at once, including:
- A racing or pounding heartbeat
- Shaky hands or trembling
- Excessive sweating or feeling unusually hot
- Difficulty sleeping or settling down
- Unexplained weight loss
- Irritability, nervousness or restlessness
These symptoms can feel frightening, particularly when they appear without an obvious trigger. A racing heart or sudden wave of fear may even resemble a panic attack.
Your GP can review your symptoms, medical history and medicines before deciding which tests you need. If thyroid disease contributes to your anxiety, appropriate thyroid treatment may help. Some people still experience anxiety after their thyroid function improves, so they may also need mental health care.
For more information about anxiety assessment and treatment, explore the different ways clinicians approach anxiety.
Can Hypothyroidism Cause Depression?
Yes. Hypothyroidism means your thyroid does not produce enough hormone, and it can contribute to low mood, tiredness, and reduced motivation. Some people also experience slower thinking or poor concentration.
Hashimoto’s thyroiditis, an autoimmune condition, is the most common cause of hypothyroidism in Australia. Other possible symptoms include feeling unusually cold, constipation, dry skin, brittle hair and unexplained weight gain.
These changes can affect everyday life. You may struggle to get through work, keep up with responsibilities or enjoy activities you previously liked. Persistent fatigue can also make emotional difficulties harder to manage.
However, hypothyroidism does not explain every case of depression. Depression can occur with normal thyroid function, and both conditions can affect the same person.
Your GP can assess your physical and emotional symptoms together. They may arrange blood tests and discuss whether your symptoms fit a thyroid condition, depression, or both.
You can also read about common signs and causes of depression to understand the wider range of factors that may affect mood.
Subclinical Hypothyroidism and Depression: What Research Shows
Subclinical hypothyroidism means your TSH result sits outside the laboratory’s reference range, while your free T4 remains within range. It does not always cause noticeable symptoms, and not everyone needs treatment.
Some studies have found a link between subclinical hypothyroidism and depression. However, other large analyses have found no clear, clinically meaningful connection with later depressive symptoms.
Research has also not shown a consistent improvement in depression scores when people take thyroxine for mild thyroid dysfunction.
This evidence does not mean your symptoms are unimportant. It means your doctor needs to consider your results, symptoms and wider health before recommending treatment.
Your GP will decide whether treatment or follow-up testing makes sense for your situation. If depression continues, depression treatment options may help you understand the available approaches.
Not only your GP, but also a psychiatrist can assess your condition and refer you to a specialist.
Hashimoto’s, Graves’ and Mental Health: Can Thyroid Antibodies Affect Mood?
Hashimoto’s thyroiditis and Graves’ disease occur when the immune system mistakenly targets parts of the thyroid. Hashimoto’s commonly causes an underactive thyroid, while Graves’ often causes an overactive thyroid.
Research suggests that people with autoimmune thyroid disease may experience anxiety and depression more often than people without these conditions. Some studies have also found associations among people whose thyroid hormone levels remain within normal limits.
However, these findings do not prove that thyroid antibodies directly cause mental health conditions. Researchers still debate the reasons behind these associations, and studies have limitations.
Your GP may request thyroid antibody tests when your symptoms or thyroid results suggest an autoimmune condition. TPO antibodies can support an assessment for Hashimoto’s; TSH-receptor antibodies can help investigate Graves’ disease.
Antibody results alone cannot diagnose anxiety or depression. They also do not automatically mean you need thyroid treatment. Your doctor will interpret them alongside your thyroid function, symptoms, and medical history.
Thyroid Symptoms vs Anxiety and Depression Symptoms
Thyroid conditions and mental health disorders can cause similar symptoms. The following table highlights common patterns, but it cannot determine the cause of your symptoms.
Symptoms | Overactive Thyroid | Underactive Thyroid | Anxiety or Depression |
Racing heart | Common | Less typical | Can occur with anxiety |
Trembling | Can occur | Less typical | Can occur with anxiety |
Heat or cold intolerance | Often feels unusually hot | Often feels unusually cold | Not a defining feature |
Weight change | Weight loss may occur | Weight gain may occur | Appetite changes may affect weight |
Fatigue | Can occur despite restlessness | Common | Common |
Low mood | Can occur | Can occur | Common in depression |
Worry or restlessness | Common | Possible | Common in anxiety |
Sleep changes | Difficulty sleeping may occur | Increased sleepiness may occur | Either pattern can occur |
Poor concentration | Can occur | Can occur | Can occur |
Dry skin or hair changes | Hair may become fine or brittle | Dry skin and brittle hair may occur | Not defining features |
Overlapping symptoms are exactly why a blood test may help. A table cannot diagnose you, and symptoms alone cannot reliably separate thyroid disease from anxiety or depression.
Which Blood Test Checks the Thyroid? TSH, T4 and T3 Explained
Your GP will usually start with a thyroid-stimulating hormone (TSH) blood test. If the result falls outside the expected range, they may request free T4 or free T3 tests. These results help assess thyroid function and guide the next steps. Healthdirect explains thyroid function tests.
Here is what each test measures:
TSH
The pituitary gland produces this hormone to help control thyroid hormone production. A high result may suggest an underactive thyroid, while a low result may suggest an overactive thyroid.
Free T4
Free T4 measures the available thyroxine in your blood. It helps your doctor assess how much thyroid hormone circulates.
Free T3
Free T3 measures available triiodothyronine, another thyroid hormone. Your GP may request it when investigating suspected hyperthyroidism.
Thyroid antibodies
These tests can help identify autoimmune causes, such as Hashimoto’s or Graves’ disease.
TSH results do not tell the whole story in every case. Other health conditions, medicines and pituitary problems can affect how your doctor interprets them.
Your GP can arrange the appropriate blood tests and refer you to a pathology collection center. You can learn more about GP health checks and blood test review through Elyséa HEALTH’s GP service information.
How Thyroid Testing Works With Medicare in Australia
Medicare benefits depend on the test, the reason for testing and the relevant eligibility rules. The Medicare Benefits Schedule lists circumstances where a doctor can request additional thyroid tests, including free T4 or free T3 alongside TSH.
For example, item 66719 covers qualifying thyroid function testing when TSH falls outside the laboratory’s reference range. It also includes certain situations involving thyroid monitoring, suspected pituitary dysfunction, or medicines that affect thyroid function.
This does not mean every thyroid test automatically costs nothing. Medicare benefits and any out-of-pocket costs depend on the service and the provider’s billing arrangements. Your GP or pathology provider can explain the likely costs before testing.
Medicare rules checked against the published MBS item 66719 in October 2026. Always confirm current eligibility with your provider.
Will Treating My Thyroid Fix My Mood?
Treating an underlying thyroid condition can improve mood symptoms when thyroid hormone levels contribute to them. However, treatment may not resolve every symptom, especially when another health or mental health condition also affects you. Your doctor needs to assess your progress rather than rely on blood results alone.
If your thyroid levels improve, you may notice better energy, sleep or emotional stability over time. Recovery can vary, and some symptoms may take longer to improve.
A normal thyroid result also does not mean your emotional distress is imaginary. Anxiety and depression can occur independently of thyroid disease and deserve appropriate assessment.
Keep your GP informed about changes in mood, sleep, concentration and daily functioning. They can review your treatment and decide whether you need further tests or additional support.
Why Anxiety or Low Mood Can Continue on Thyroid Medication
Several factors may explain ongoing symptoms, even when you take levothyroxine (thyroxine) or another thyroid medicine.
Your dose may need review, or your body may still need time to respond to treatment. Too much thyroid hormone can also cause symptoms such as palpitations, shakiness, and nervousness. Blood tests help your doctor decide whether to adjust your treatment.
You may also have a separate anxiety or depressive disorder. Poor sleep, ongoing stress and the demands of managing a chronic condition can affect your wellbeing, too.
Do not stop thyroid medication or change your dose without medical advice. If symptoms persist or worsen, speak with your GP.
Healthdirect also recommends medical review when symptoms continue despite thyroid replacement treatment. You can explore how anxiety is understood and managed for a broader explanation of assessment and support.
Who Has a Higher Risk of Thyroid-Related Mood Changes?
Some people are more likely to develop thyroid conditions or experience changes in thyroid function.
- Women: Thyroid conditions occur more often in women than in men.
- Family history: A close relative with thyroid disease or an autoimmune condition may increase your risk.
- After childbirth: Postpartum thyroiditis can develop during the first year after birth. It may cause an overactive phase, an underactive phase or both.
- People taking lithium: Lithium can affect thyroid function and may contribute to hypothyroidism. Your prescriber may recommend monitoring.
- People with other autoimmune conditions: Conditions such as type 1 diabetes can occur alongside autoimmune thyroid disease.
Postpartum thyroiditis affects an estimated 5% of people within the first year after childbirth. Its symptoms can overlap with postnatal depression or anxiety, including fatigue, irritability and sleep difficulties.
If you recently gave birth and notice emotional or physical changes, tell your GP. Don’t assume every symptom is due to hormonal changes after birth.
Early assessment can help identify the right support. If you take lithium, keep your monitoring appointments and discuss new symptoms with your treating clinician. Do not stop lithium or change any prescribed medicine on your own.
Thyroid Problems and Mental Health: When to See a GP or a Psychiatrist
You do not need to work out the cause of your symptoms on your own. A GP can help assess possible physical causes and decide whether you need further thyroid testing, mental health support or both.
A practical approach often involves these steps:
Start with your GP
Explain when your mood changes began and mention physical symptoms, family history and any recent pregnancy.
Review your health and medicines
Your GP may examine you, review your medication, and request TSH or other tests where appropriate.
Follow up abnormal results
Your GP can discuss treatment and may refer you to an endocrinologist if your condition needs specialist care.
Seek mental health assessment when needed
If your results do not explain your symptoms, or your mood remains low, a psychologist or psychiatrist may help. An adult psychiatry assessment can form part of that process.
Keep care connected
Your GP and mental health clinician can consider both physical and emotional factors when planning your care.
Elyséa HEALTH provides information about integrated, whole-person mental health care that recognises physical health and mental wellbeing can influence each other.
FAQs
Can thyroid problems cause panic attacks?
Yes. An overactive thyroid can cause a racing heart, trembling, and intense nervousness that feel like panic attacks. Your GP can help identify the cause.
Does a normal TSH rule out a thyroid cause of anxiety?
A normal TSH makes some thyroid problems less likely, but your GP must interpret it alongside your symptoms, medical history and other test results.
Can thyroid medication cause anxiety?
Yes. Too much thyroid hormone can cause nervousness, trembling and palpitations. Speak with your GP before changing your medication.
Can lithium or antidepressants affect the thyroid?
Lithium can contribute to an underactive thyroid. Some medicines can also affect thyroid function. Discuss your medication and any new symptoms with your GP.
Can postpartum thyroid problems look like postnatal depression?
Yes. Postpartum thyroiditis can cause fatigue, anxiety, and mood changes that overlap with postnatal depression. Your GP can assess whether thyroid testing or mental health support may help.
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