Hyperthyroidism

What is hyperthyroidism?

Your thyroid is a butterfly-shaped gland located at the front of your neck. It releases hormones, mainly thyroxine (T4) and triiodothyronine (T3), that control how your body uses energy. These hormones affect almost everything from metabolism, mood, temperature, and even your heartbeat.

In hyperthyroidism, the thyroid produces and releases excessive amounts of thyroid hormone. This speeds up many body processes, which can make you feel unusually energetic, anxious, or tired in quick cycles.

Persistent or untreated hyperthyroidism can affect several organ systems. Important complications include atrial fibrillation and accelerated bone loss, particularly when thyroid hormone levels remain elevated over time.

The opposite condition, hypothyroidism, occurs when the thyroid produces too little hormone, slowing down the body’s systems instead.

Symptoms of hyperthyroidism

Hyperthyroidism symptoms reflect the body's accelerated state. They develop gradually and are frequently attributed to anxiety, stress, or lifestyle changes. Common signs include:

• Unexplained weight loss despite normal or increased appetite

• Rapid, irregular, or pounding heartbeat (palpitations)

• Nervousness, anxiety, or irritability

• Fine tremor, particularly of the hands and fingers

• Heat intolerance and excessive sweating

• Fatigue and muscle weakness

• Difficulty sleeping

• Frequent bowel movements or diarrhoea

• Hair thinning or brittle nails

In Graves' disease specifically:

• Goitre, that is, visible or palpable thyroid enlargement at the front of the neck

• Eye changes such as proptosis (bulging eyes), lid retraction, or eye irritation (Graves' ophthalmopathy)

• Pretibial myxoedema, that is, a rare skin change on the shins

In older adults, hyperthyroidism may cause fewer of the typical symptoms and can instead present with fatigue, weakness, weight loss, depression, or atrial fibrillation.

What causes hyperthyroidism?

Hyperthyroidism results from conditions that stimulate excessive thyroid hormone production. Contributing causes include:

• Autoimmune conditions: The most common cause is Graves’ disease, where the immune system mistakenly stimulates the thyroid to produce too much hormone.

• Thyroid nodules: Small growths in the gland can become overactive and release excess hormone.

• Thyroid inflammation: Thyroiditis can cause a temporary increase in circulating thyroid hormones as stored hormones are released from the inflamed gland.

• Excess iodine intake: High iodine exposure from supplements, medications, or contrast agents can trigger hyperthyroidism in susceptible people, particularly those with underlying thyroid disease.

• Family history and genetics: A family link may increase the likelihood of thyroid imbalances.

How is hyperthyroidism detected?

Hyperthyroidism is primarily assessed with blood tests measuring TSH and thyroid hormone levels. Neck MRI adds structural context. The pattern of results helps determine whether thyroid function is overtly or subclinically abnormal and whether further testing is needed to identify the cause.

Blood tests: Elfcare's panel includes a comprehensive thyroid profile covering hormone levels and the key autoimmune marker for Graves' disease:

• TSH: usually low or suppressed in primary hyperthyroidism and generally used as the initial screening test. TSH can be abnormal before free T4 or free T3 become elevated, particularly in subclinical hyperthyroidism.

• Free T4: elevated in overt hyperthyroidism. May be normal in early or subclinical disease

• Free T3: can be elevated when T4 remains normal, a pattern known as T3 toxicosis. It is particularly useful when hyperthyroidism is suspected despite a normal free T4.

• TRAK (TSH receptor antibodies): supports a diagnosis of Graves' disease when elevated and can help distinguish Graves' disease from other causes of hyperthyroidism.

• Calcium: hyperthyroidism accelerates bone turnover and can elevate serum calcium

• ALP (alkaline phosphatase): elevated in hyperthyroidism reflecting increased bone remodelling activity

Neck MRI: Elfcare's full body MRI covers the neck soft tissues and can identify thyroid enlargement (goitre), structural changes consistent with Graves' disease, and autonomously functioning nodules, structural correlates of hyperthyroidism that provide important context alongside blood results.

Why early detection matters

Identifying hyperthyroidism can help determine the cause of symptoms and reduce the risk of complications when thyroid hormone levels remain elevated. Persistent or untreated hyperthyroidism can increase the risk of atrial fibrillation, heart failure, bone loss, and fractures, particularly in older adults and people with more severe disease.

Early assessment can also identify conditions such as Graves' disease or overactive thyroid nodules, allowing appropriate monitoring and treatment. The need for treatment depends on the severity and cause of the thyroid dysfunction, the person's age and other health conditions, and whether symptoms or complications are present.

Understanding your thyroid status empowers you to act before complications develop, moving from reactive concern to proactive health management.

How Elfcare can help

Elfcare's blood panel includes TSH, Free T4, Free T3, and TRAK, a complete thyroid profile that detects both the hormonal overactivity and, in the case of Graves' disease, the specific autoimmune mechanism driving it. Suppressed TSH is detectable before T4 or T3 become clearly elevated, making this one of the earliest possible detection windows for hyperthyroidism.

Our neck MRI adds structural context, identifying goitre or nodules that may be contributing to excess hormone production.

If our blood tests identify thyroid dysfunction or related findings, we take care of further diagnostics or refer you to the appropriate specialist.