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Hyperthyroidism – Causes, Symptoms and Treatment

Hyperthyroidism is a condition in which the thyroid gland produces excessive amounts of thyroid hormones, accelerating the body´s metabolism and causing a wide range of symptoms.

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Things worth knowing about "Hyperthyroidism"

Hyperthyroidism is a condition in which the thyroid gland produces excessive amounts of thyroid hormones, accelerating the body´s metabolism and causing a wide range of symptoms.

What is Hyperthyroidism?

Hyperthyroidism (overactive thyroid) is a medical condition in which the thyroid gland produces and releases too much of the thyroid hormones thyroxine (T4) and triiodothyronine (T3) into the bloodstream. These hormones play a key role in regulating metabolism, heart rate, body temperature, and many other bodily functions. An excess of these hormones speeds up numerous body processes, leading to a variety of physical and psychological symptoms.

Causes

The most common causes of hyperthyroidism include:

Graves disease: An autoimmune disorder in which the immune system produces antibodies that stimulate the thyroid to produce excess hormones. This is the most common cause, especially in younger adults.
Thyroid nodules (toxic nodular goiter): One or more nodules in the thyroid gland may become autonomous and produce hormones independently of the body´s normal regulatory mechanisms, more commonly in older patients.
Thyroiditis: Inflammation of the thyroid gland (e.g., early-stage Hashimoto thyroiditis or subacute thyroiditis) can cause a temporary release of stored hormones.
Excess iodine intake: High amounts of iodine -- from iodine-containing contrast agents, supplements, or medications such as amiodarone -- can trigger hyperthyroidism.
Medication-induced: Certain drugs can interfere with thyroid hormone regulation and trigger overproduction.

Symptoms

Because thyroid hormones affect nearly every organ system, hyperthyroidism can present with a wide range of symptoms:

Rapid heartbeat (tachycardia), irregular heart rhythm, elevated blood pressure
Nervousness, anxiety, irritability, and sleep disturbances
Unintentional weight loss despite increased appetite
Heat intolerance and excessive sweating
Trembling hands (tremor)
Frequent bowel movements or diarrhea
Muscle weakness and fatigue
In Graves disease: enlarged thyroid gland (goiter) and protruding eyes (exophthalmos)

Diagnosis

Diagnosis is typically confirmed through a combination of the following assessments:

Blood tests: Measurement of T3, T4, and TSH (thyroid-stimulating hormone) levels. In hyperthyroidism, T3 and T4 are elevated while TSH is suppressed.
Antibody testing: Detection of TSH receptor antibodies helps confirm Graves disease as the underlying cause.
Thyroid ultrasound: Imaging to evaluate the size, structure, and presence of nodules in the thyroid gland.
Thyroid scintigraphy: A nuclear medicine scan that assesses thyroid activity and identifies autonomously functioning areas.

Treatment

Treatment depends on the underlying cause, disease severity, and the individual characteristics of the patient:

Antithyroid Medications

Antithyroid drugs such as methimazole, carbimazole, or propylthiouracil block the production of thyroid hormones. They are often the first line of treatment, particularly for Graves disease.

Radioiodine Therapy

Radioactive iodine (iodine-131) is administered orally and selectively absorbed by the thyroid gland, where it destroys overactive thyroid tissue. This approach is particularly suitable for older patients or those with autonomous nodules.

Surgical Treatment

A thyroidectomy (surgical removal of all or part of the thyroid gland) may be recommended when the thyroid is significantly enlarged, when nodules are present, or when other treatments are not effective. After total thyroidectomy, lifelong thyroid hormone replacement therapy is required.

Symptomatic Treatment

Beta-blockers (e.g., propranolol) may be used temporarily to relieve symptoms such as rapid heartbeat and tremor while definitive treatment takes effect.

References

Ross DS et al.: 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism. Thyroid, 2016.
Kahaly GJ et al.: 2018 European Thyroid Association Guideline for the Management of Graves Hyperthyroidism. European Thyroid Journal, 2018.
World Health Organization (WHO): Thyroid disorders and iodine nutrition. WHO Technical Report, Geneva.

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