The short answer: Yes. An overactive thyroid (hyperthyroidism) can cause nervousness, a racing heart, shaky hands, sweating and poor sleep, which can look just like an anxiety disorder. Inflammation of the thyroid (thyroiditis) can do the same for a few weeks or months. A simple blood test, starting with TSH, tells the two apart, and anxiety from an overactive thyroid often eases once hormone levels come down.
Which thyroid problems can cause anxiety symptoms?
The thyroid is a small gland in the front of the neck. It makes hormones that set the speed of many body functions. When it makes too much, the body runs fast. When it makes too little, the body slows down.
- Hyperthyroidism (overactive thyroid). This is the main thyroid cause of anxiety-like symptoms. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) lists nervousness, irritability, trouble sleeping, a rapid or irregular heartbeat, and shaky hands among its symptoms. About 1 in 100 Americans ages 12 and older have it. Graves' disease is the most common cause.
- Thyroiditis. Some types of thyroid inflammation let stored hormone leak into the blood. NIDDK names subacute thyroiditis, postpartum thyroiditis (after giving birth), and painless thyroiditis. The overactive phase can later turn into an underactive phase.
- Too much thyroid medicine. A dose of levothyroxine that is too high can push hormone levels above normal. A 2022 review in American Family Physician lists levothyroxine among the medicines that can produce symptoms of anxiety and panic.
- Hypothyroidism (underactive thyroid). This is less clear. NIDDK lists fatigue, weight gain, feeling cold and depression as its common symptoms. Anxiety is not on that list, but studies do link autoimmune thyroid disease with anxiety disorders (see below).
Why do thyroid and anxiety symptoms look so alike?
Thyroid hormone and the body's stress response push many of the same systems. Both raise heart rate, both make muscles twitchy, and both disturb sleep. That is why a person with an overactive thyroid can feel "wired" with no worry to explain it.
Symptoms the two conditions share:
- Racing or pounding heartbeat
- Shaky hands or a fine tremor
- Sweating
- Trouble falling or staying asleep
- Irritability and feeling on edge
- Fatigue
Some signs point more toward the thyroid. NIDDK lists weight loss despite a bigger appetite, trouble tolerating heat, more frequent bowel movements, and a swelling in the neck called a goiter. Graves' disease can also cause eye changes. Anxiety on its own does not cause these. For the full range of body symptoms that anxiety can cause, see our guide to the physical symptoms of anxiety.
Age changes the picture. NIDDK notes that in older adults, hyperthyroidism is sometimes mistaken for depression or dementia, and may show up as loss of appetite or withdrawal from people.
How strong is the link between thyroid disease and anxiety?
The link is real in clinic patients, but smaller in the general population.
- People treated for hyperthyroidism. In a 2023 prospective study of 176 patients at a UK endocrine clinic, 40.5% had moderate or severe anxiety on the GAD-7 scale when they first came in. About half (50.6%) had moderate or severe depression.
- Autoimmune thyroiditis. A 2018 meta-analysis in JAMA Psychiatry pooled 19 studies with 36,174 participants. People with autoimmune thyroiditis, Hashimoto's thyroiditis, or subclinical or overt hypothyroidism had 2.32 times the odds of an anxiety disorder compared with healthy controls. Most of these were case-control studies.
- Population studies. A 2026 meta-analysis in PeerJ looked only at population-based studies: 12 studies with 676,658 people. Hyperthyroidism had a small link with anxiety (odds ratio 1.38). The links for hypothyroidism (1.13) and thyroid antibodies (1.47) were not statistically significant. The authors called the evidence inconclusive.
Put simply, anxiety is common in people who are sick enough to see a thyroid specialist. Across everyone with mild thyroid changes, the effect looks modest. Hyperthyroidism has the clearest link.
Which blood tests tell a thyroid problem from anxiety?
A blood test, not symptoms, makes the diagnosis. NIDDK states that hyperthyroidism cannot be diagnosed from symptoms alone, because many of its symptoms match those of other conditions.
- TSH (thyroid stimulating hormone). This is usually the first test, per NIDDK's thyroid tests guide. TSH comes from the pituitary gland and tells the thyroid how much hormone to make. A low TSH usually means an overactive thyroid. A high TSH most often means an underactive thyroid.
- Free T4. If TSH is abnormal, at least one more test follows. A high T4 may mean hyperthyroidism, and a low T4 may mean hypothyroidism. Free T4 is the portion not bound to blood proteins.
- T3 and thyroid antibodies. These help find the cause, such as Graves' disease or Hashimoto's disease. Imaging tests can help too.
Pregnancy, birth control pills, severe illness and corticosteroids can shift T4 results. Tell the doctor about these before testing.
Do anxiety guidelines call for a thyroid test?
They tell clinicians to rule out medical causes, but they do not require a thyroid test for every patient.
- The DSM-5 criteria for generalized anxiety disorder, reprinted in the American Family Physician review, say the symptoms must not be due to another medical condition. Hyperthyroidism is the example the criteria give.
- That same review lists hyperthyroidism first among medical conditions whose symptoms can look like generalized anxiety disorder or panic disorder. Others include heart rhythm problems, asthma, COPD, and caffeine or alcohol use and withdrawal.
- The UK's NICE guideline CG113 asks clinicians to consider any coexisting medical condition when they assess generalized anxiety disorder. For a panic attack in the emergency department, it advises only the minimum tests needed to exclude acute physical problems. It does not name a thyroid test.
In practice, many doctors order a TSH when anxiety is new, when physical symptoms lead, or when thyroid signs are present. If your symptoms began suddenly or come with weight loss or heat intolerance, it is reasonable to ask for one. Our guide on when to see a doctor for anxiety covers what to expect at that visit.
Does the anxiety go away once the thyroid is treated?
Often it improves, but not always all the way.
- Short-term relief. NIDDK says beta-blockers can reduce tremors, rapid heartbeat and nervousness until other treatments start working. These medicines block the effect of adrenaline. Our article on propranolol for anxiety explains how this drug class works.
- Treating the thyroid itself. Hyperthyroidism is usually treated with medicines, radioactive iodine, or surgery. The goal is to bring hormone levels back to normal.
- What happens next. In the 2023 UK study, psychiatric symptoms improved after treatment, and the improvement tracked with falling T4 levels. But a large share of patients still had anxiety or depression after their thyroid levels were normal.
If anxiety continues once your thyroid tests are normal, it deserves its own care. Therapy and the usual anxiety treatments still apply. The thyroid side of the story, including panic attacks in Graves' disease, is covered in depth at thyroid.md.
The bottom line
An overactive thyroid is a well-known cause of anxiety-like symptoms, and thyroiditis or too much thyroid medicine can do the same. The overlap is large: racing heart, tremor, sweating and poor sleep. Weight loss, heat intolerance and a neck swelling point toward the thyroid. A TSH test, followed by free T4 if needed, sorts it out. Anxiety often eases with thyroid treatment, but if it lingers, treat it as anxiety in its own right.
Last updated: October 2026. This article is for informational purposes only and does not constitute medical advice. Talk with your doctor about thyroid testing and before starting or changing any thyroid or anxiety medicine.