Thyroid disorders are common and often develop gradually, making them easy to overlook. The thyroid is a small gland in your neck that helps regulate your metabolism, energy levels, heart rate, and body temperature. When it produces too little or too much thyroid hormone, it can affect nearly every part of your body.
This article explains the most common thyroid disorders, including hypothyroidism, hyperthyroidism, thyroid nodules, goiter, and thyroiditis. You'll also learn about common symptoms, diagnosis, treatment options, and how Medicare may help cover medically necessary testing, specialist visits, medications, surgery, and follow-up care.
In this article
Symptoms
Prevention
Diagnosis
Treatment
Recovery
Medications
Common Questions
What Are Thyroid Disorders?
Thyroid disorders are conditions that affect the thyroid gland, a small butterfly-shaped gland located at the front of the neck. The thyroid produces hormones that help regulate your body's metabolism, heart rate, body temperature, energy levels, and many other important functions.
When the thyroid produces too little hormone (hypothyroidism) or too much hormone (hyperthyroidism), it can affect nearly every organ in the body. Thyroid nodules, goiter (an enlarged thyroid), thyroiditis (inflammation), and thyroid cancer are other common thyroid conditions.
The good news is that most thyroid disorders can be diagnosed with simple blood tests and are highly treatable. Medicare often helps cover medically necessary testing, treatment, medications, and surgery.
Medicare Tip: If your doctor believes you have symptoms of a thyroid disorder, medically necessary testing and treatment are generally covered when Medicare requirements are met.^1
Types of Thyroid Disorders and Symptoms
The most common thyroid disorders include:
Hypothyroidism
Hypothyroidism occurs when the thyroid does not produce enough thyroid hormone.
Common symptoms include:
Fatigue
Weight gain
Feeling cold
Constipation
Dry skin
Depression
Slow heart rate
Memory problems
Hyperthyroidism
Hyperthyroidism occurs when the thyroid produces too much hormone.
Symptoms may include:
Weight loss
Rapid heartbeat
Anxiety
Tremors
Heat intolerance
Sweating
Trouble sleeping
Frequent bowel movements
Why Thyroid Disorders Matter
Thyroid disease is common in the United States, especially among older adults.
Approximately 20 million Americans have some form of thyroid disease.
Women are affected more often than men, but thyroid disorders become increasingly common in men as they age.
Millions of people have thyroid disease without knowing it because symptoms often develop gradually.
Untreated thyroid disease can increase the risk of heart disease, abnormal heart rhythms, osteoporosis, depression, high cholesterol, infertility, and cognitive changes.^2
Because symptoms often resemble normal aging or other medical conditions, proper evaluation is important.
Causes and Risk Factors
Several factors increase the risk of thyroid disease.
Common risk factors include:
Age over 60
Family history of thyroid disease
Autoimmune diseases
Previous radiation treatment to the neck
Certain medications
Iodine deficiency or excess (rare in the United States)
Previous thyroid surgery
Female sex, although men can also develop thyroid disease
Prevention
Not every thyroid disorder can be prevented, but healthy habits may reduce risk and help support overall thyroid function.
You can:
Eat a balanced diet
Get enough iodine through normal foods (avoid excessive supplements unless recommended)
Manage autoimmune diseases
Attend regular medical checkups
Tell your doctor about new symptoms that persist
Medicare Tip: Medicare generally does not cover routine thyroid screening in people without symptoms or medical risk factors. However, testing is often covered when medically necessary.^1
While not all thyroid disorders can be prevented, maintaining a healthy lifestyle, getting regular medical checkups, and discussing persistent symptoms with your healthcare provider can help detect problems earlier.
Diagnosis
Your healthcare provider may recommend:
Medical history
Physical examination
Thyroid-stimulating hormone (TSH) blood test
Free T4 and sometimes Free T3 blood tests
Thyroid antibody tests
Thyroid ultrasound
Radioactive iodine uptake scan (when appropriate)
Fine-needle aspiration biopsy of suspicious nodules
These tests help determine the type and severity of the thyroid disorder.
Medicare Coverage: Medicare Part B generally covers medically necessary physician visits, laboratory testing, imaging studies, and biopsies used to diagnose thyroid disorders when ordered by your healthcare provider.^1
Treatment
Treatment depends on the specific thyroid condition.
Options may include:
Medications
Thyroid hormone replacement (such as levothyroxine)
Anti-thyroid medications
Beta blockers to help control symptoms
Radioactive Iodine Therapy
Used primarily to treat some forms of hyperthyroidism and certain thyroid cancers.
Surgery
Some patients may need surgery to remove part or all of the thyroid because of:
Large goiters
Suspicious nodules
Thyroid cancer
Hyperthyroidism that cannot be controlled with other treatments
Most thyroid disorders can be successfully managed with medication, regular blood tests, and ongoing monitoring. Some people may also need radioactive iodine treatment or surgery, depending on the condition.
Medicare Coverage
Medicare Part B generally covers medically necessary outpatient treatment, physician services, laboratory monitoring, imaging, and follow-up care. Medicare Part A may help cover medically necessary inpatient hospitalization if thyroid surgery or complications require admission.^1
Recovery and Long-Term Follow-Up
Many thyroid disorders require lifelong management.
Your provider may recommend:
Regular TSH blood testing
Medication adjustments
Follow-up ultrasounds for thyroid nodules
Monitoring after thyroid surgery
Long-term follow-up after thyroid cancer treatment
Most people can lead healthy, active lives with proper treatment.
Prescription Drug Coverage
Many thyroid medications are taken long term.
Common examples include:
Levothyroxine
Methimazole
Propylthiouracil (PTU)
Beta blockers prescribed for hyperthyroidism symptoms
Medicare Coverage: Most self-administered thyroid medications are typically covered under Medicare Part D or a Medicare Advantage prescription drug plan, depending on your plan's formulary. Coverage, prior authorization, quantity limits, and copayments vary by plan.^3
Many thyroid medications—including levothyroxine and medications used to treat thyroid disorders—are typically covered under a Medicare Part D prescription drug plan.
What Medicare Usually Does Not Cover
Medicare generally does not cover:
Routine thyroid screening without symptoms or medical necessity
Over-the-counter thyroid supplements
Nutritional supplements unless specifically covered
Cosmetic procedures unrelated to medical treatment
Medicare Advantage Considerations
If you have a Medicare Advantage (Part C) plan:
Your plan must cover all medically necessary services covered by Original Medicare.
Many plans require you to use network providers.
Specialist referrals or prior authorization may be required for certain imaging studies, radioactive iodine treatment, or surgery.
Prescription drug coverage varies by plan.
Review your plan's provider network and drug formulary before receiving non-emergency care.
Common Questions
At what age can thyroid problems start?
Thyroid disorders can develop at any age, including infancy and childhood. However, they become more common during adulthood, particularly after age 60. Older adults may have more subtle symptoms, making proper evaluation especially important.
What is the number one food for thyroid health?
There is no single "best" food for thyroid health. Most people benefit from a balanced diet that includes adequate iodine, selenium, zinc, lean protein, fruits, vegetables, whole grains, dairy, seafood, and eggs. In the United States, iodine deficiency is uncommon because iodized salt is widely available. Unless your healthcare provider recommends them, avoid taking large amounts of iodine supplements because too much iodine can worsen certain thyroid disorders.
What to Do Next
If you have ongoing fatigue, unexplained weight changes, changes in heart rate, neck swelling, or other symptoms that could be related to your thyroid, schedule an appointment with your healthcare provider.
They may recommend simple blood tests or imaging to determine whether a thyroid disorder is present. If you're enrolled in Medicare, review your coverage for laboratory testing, specialist visits, prescription medications, and any recommended treatment.
Learn more about Medicare
Key Takeaways
The thyroid controls many important body functions, including metabolism and energy levels.
Hypothyroidism and hyperthyroidism are the most common thyroid disorders.
Simple blood tests can diagnose many thyroid conditions.
Most thyroid disorders respond well to treatment and long-term monitoring.
Medicare generally covers medically necessary testing, physician visits, imaging, surgery, and follow-up care.
Most thyroid medications are covered through Medicare Part D or Medicare Advantage drug coverage.
References
This website is for educational purposes only. It isn’t medical advice, legal advice, or financial advice. It also isn’t a promise of coverage or payment. For official Medicare information, visit Medicare.gov. You can also get free, unbiased help from your State Health Insurance Assistance Program (SHIP). For personal medical guidance, talk with your doctor, and review your Medicare plan documents.