Thyroid disorders

What is Thyroid disorders?

Thyroid disorders happen when your thyroid gland makes too much or too little thyroid hormone. Your thyroid is a small butterfly-shaped gland in your neck that controls your metabolism. Metabolism is how your body turns food into energy and manages vital functions like heart rate and body temperature.

The two main types of thyroid disorders are hypothyroidism and hyperthyroidism. Hypothyroidism means your thyroid is underactive and does not make enough hormone. This slows down your body's functions. Hyperthyroidism means your thyroid is overactive and makes too much hormone. This speeds up your body's functions.

Thyroid disorders affect about 20 million Americans. Women are 5 to 8 times more likely than men to have thyroid problems. Many people with thyroid disorders do not know they have them because symptoms can develop slowly over time. Early detection through blood testing helps you manage the condition before serious complications develop.

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Symptoms

Unexplained weight gain or weight loss
Feeling tired or having low energy despite rest
Feeling cold all the time or feeling too hot and sweating
Dry skin and brittle hair or thinning hair
Constipation or frequent bowel movements
Muscle weakness or trembling hands
Slow or rapid heartbeat
Trouble sleeping or sleeping too much
Changes in mood like depression or anxiety
Memory problems or difficulty concentrating
Swelling in the neck where the thyroid gland is located

Many people have no obvious symptoms in the early stages of thyroid disorders. Symptoms often develop gradually over months or years. Some people only discover their thyroid problem through routine blood work.

Causes and risk factors

Thyroid disorders have several different causes depending on the type. Autoimmune diseases are the most common cause of both hypothyroidism and hyperthyroidism. In Hashimoto's thyroiditis, your immune system attacks your thyroid and causes low hormone levels. In Graves' disease, your immune system causes your thyroid to make too much hormone. Other causes include thyroid nodules, thyroid surgery, radiation treatment to the neck, and certain medications like lithium.

Risk factors include being female, being over age 60, having a family history of thyroid disease, and having other autoimmune conditions. Pregnancy can trigger thyroid problems that may continue after delivery. Iodine deficiency or excess can also affect thyroid function. Certain medications, especially lithium used for bipolar disorder, can interfere with how your thyroid releases hormones and lead to thyroid dysfunction.

How it's diagnosed

Doctors diagnose thyroid disorders primarily through blood tests that measure thyroid hormones and thyroid-stimulating hormone or TSH. TSH is made by your pituitary gland and tells your thyroid how much hormone to produce. Blood tests typically measure TSH, free T4, and sometimes free T3. High TSH with low T4 suggests hypothyroidism. Low TSH with high T4 suggests hyperthyroidism.

Your doctor may also test for thyroid antibodies to check for autoimmune thyroid disease. Specialized testing may be needed beyond standard panels to fully assess thyroid function. Talk to a doctor about which tests are right for you based on your symptoms and health history. Additional tests like thyroid ultrasound or thyroid scan may help identify nodules or other structural problems.

Treatment options

Thyroid hormone replacement medication like levothyroxine for hypothyroidism
Anti-thyroid medications to reduce hormone production in hyperthyroidism
Beta-blockers to manage rapid heartbeat and other hyperthyroid symptoms
Radioactive iodine treatment to reduce thyroid activity
Thyroid surgery in some cases to remove part or all of the thyroid
Eating a balanced diet with adequate selenium and iodine
Managing stress through relaxation techniques and adequate sleep
Avoiding excess iodine from supplements unless directed by your doctor
Regular monitoring with blood tests to adjust medication doses
Working with your doctor to manage other medications that affect thyroid function

Frequently asked questions

Hypothyroidism means your thyroid gland does not make enough thyroid hormone. This slows down your metabolism and causes symptoms like fatigue, weight gain, and feeling cold. Hyperthyroidism means your thyroid makes too much hormone. This speeds up your metabolism and causes symptoms like weight loss, rapid heartbeat, and feeling too hot.

Most thyroid disorders cannot be cured but can be managed very effectively with treatment. Hypothyroidism usually requires lifelong thyroid hormone replacement medication. Hyperthyroidism can sometimes be cured with radioactive iodine treatment or surgery. With proper treatment, most people with thyroid disorders live normal, healthy lives.

You should consider thyroid testing if you have symptoms like unexplained weight changes, fatigue, mood changes, or changes in heart rate. Women over 35 should consider testing every 5 years. People with a family history of thyroid disease, other autoimmune conditions, or who take lithium should also get tested regularly.

Several medications can interfere with thyroid function. Lithium, used to treat bipolar disorder, commonly affects thyroid hormone release and can cause hypothyroidism or hyperthyroidism. Amiodarone for heart rhythm problems contains high amounts of iodine and can affect thyroid function. Certain cancer drugs and interferons can also impact your thyroid.

Stress does not directly cause thyroid disorders, but it can worsen symptoms and trigger autoimmune flares. Chronic stress affects your immune system and may contribute to autoimmune thyroid diseases like Hashimoto's or Graves' disease. Managing stress through adequate sleep, relaxation techniques, and healthy lifestyle habits supports overall thyroid health.

Most people with thyroid disorders do not need to avoid specific foods. Some people with hypothyroidism may need to limit large amounts of raw cruciferous vegetables like broccoli and cabbage. These foods contain compounds called goitrogens that can interfere with thyroid function when eaten in very large quantities. Always take thyroid medication on an empty stomach, away from food, calcium, and iron supplements.

If you are on thyroid medication, your doctor will typically check your levels every 6 to 8 weeks after starting treatment or changing doses. Once your levels are stable, testing is usually done every 6 to 12 months. People with risk factors but no diagnosis may benefit from testing every few years. Your doctor will recommend a testing schedule based on your individual situation.

Yes, thyroid disorders can affect both fertility and pregnancy outcomes. Untreated hypothyroidism during pregnancy increases the risk of miscarriage, preterm birth, and developmental problems in the baby. Hyperthyroidism can also cause pregnancy complications. Women with thyroid disorders should work closely with their doctor before and during pregnancy to maintain proper hormone levels.

Thyroid nodules are lumps that form in your thyroid gland. Most nodules are benign and do not cause problems. About 5% of thyroid nodules are cancerous. Your doctor may recommend an ultrasound and possibly a biopsy to check nodules. Many nodules do not affect thyroid function and just need monitoring over time.

Diet and lifestyle are important for thyroid health but cannot replace medical treatment for diagnosed thyroid disorders. Hypothyroidism requires thyroid hormone replacement medication. Hyperthyroidism needs medical treatment to prevent serious complications. Healthy eating, stress management, adequate sleep, and avoiding toxins support thyroid function but should work alongside medical care, not replace it.