Neonatal goiter.Care & specialists in South Korea

A goiter is an abnormal enlargement of the thyroid gland, the butterfly-shaped gland at the front of the neck. It can be diffuse (uniform) or nodular, and can occur with low, normal, or high thyroid hormone levels.

Worldwide, iodine deficiency is the most common cause. In iodine-sufficient countries like the US, autoimmune thyroid disease (Hashimoto's thyroiditis or Graves' disease), benign multinodular changes, and inherited conditions are the leading causes.

Most goiters are not immediately dangerous. They become a problem when they grow large enough to compress the trachea, esophagus, or recurrent laryngeal nerve; when they cause hyperthyroidism or hypothyroidism; or when they contain a thyroid cancer.

Diagnosis starts with neck examination and a TSH blood test. Thyroid ultrasound is the single most useful imaging test, confirming enlargement and characterizing any nodules. Antibody tests identify autoimmune causes.

No. Many small, asymptomatic goiters with normal thyroid function are simply monitored with periodic TSH and ultrasound. Treatment is needed for abnormal thyroid function, compressive symptoms, cosmetically significant size, suspicious nodules, or rapid growth.

Iodine supplementation works well in early iodine-deficiency goiter, particularly in young people with diffuse enlargement. Once long-standing nodular disease has developed, iodine alone is less effective.

Goiter can cause weight gain when associated with hypothyroidism — typically 3-5 kg of fluid retention and slowed metabolism. Once levothyroxine restores normal thyroid hormone levels, this weight is usually lost over 3-6 months. Goiter with normal thyroid function does not cause weight change.

No. Goiter simply means an enlarged thyroid, and the vast majority of goiters are benign. However, thyroid cancers commonly present as nodules within a goiter, which is why suspicious nodules need ultrasound risk stratification and biopsy. About 5-10% of biopsied thyroid nodules are malignant.

After total thyroidectomy, goiter does not recur because no thyroid tissue remains. After hemithyroidectomy or partial resection, the remaining thyroid lobe can enlarge over years in 5-15% of cases. Patients with multinodular goiter are at higher risk of recurrence than those with solitary nodules.

Pregnancy raises thyroid hormone demand approximately 50%. Pre-existing borderline iodine deficiency can manifest as gestational goiter.

Heritability is moderate. First-degree relatives of patients with goiter, Hashimoto's, Graves', or thyroid cancer have a 2-4 fold higher risk. Specific genes including HLA-DR3, CTLA4, PTPN22, and TSHR contribute to autoimmune goiter risk.

A substernal goiter is one that extends below the thoracic inlet into the chest, often causing tracheal compression, dysphagia, or facial flushing on arm raising (Pemberton sign).

Both are autoimmune thyroid diseases. Hashimoto's involves anti-TPO antibodies attacking the thyroid, causing gradual hypothyroidism. Graves' involves TSH-receptor stimulating antibodies, causing hyperthyroidism plus often eye disease and pretibial myxedema.

Goiters from acute thyroiditis can shrink as inflammation resolves, often over weeks to months. Iodine-deficiency goiter can shrink with iodine repletion. Hashimoto's-related goiter typically does not regress without levothyroxine.

After total thyroidectomy, patients require lifelong daily levothyroxine to replace thyroid hormone. After hemithyroidectomy, 60-80% can maintain normal thyroid function without medication. Calcium levels are checked daily for the first 48 hours to detect transient hypocalcemia.

Per ATA 2015 guidelines, low-risk nodules (TI-RADS 3) are followed every 12-24 months; intermediate-risk (TI-RADS 4) every 6-12 months until stability is documented; high-risk nodules undergo FNA. Once a nodule is biopsy-proven benign, follow-up ultrasound every 12-24 months is reasonable.

Radioactive iodine has been used safely for over 75 years to treat Graves' disease and toxic nodular goiter. The main long-term effect is permanent hypothyroidism, treated with levothyroxine. Pregnancy and breastfeeding are absolute contraindications.

Yes. In iodine-deficient regions, school-age goiter prevalence above 5% defines an endemic area. In iodine-sufficient regions, juvenile Hashimoto's is the most common cause, often presenting in adolescent girls with subtle hypothyroidism.

Fine-needle aspiration is performed in clinic under ultrasound guidance after local anesthetic. A thin needle is passed 2-4 times through the nodule, each pass lasting only seconds. Most patients report mild pressure and brief sharp sensation. Mild soreness and bruising for 1-3 days is normal.

Levothyroxine and antithyroid drugs are inexpensive generics, typically under USD 15 per month. Ultrasound and TSH testing are covered by most insurance and Medicare. Radioiodine therapy costs USD 1,000-3,000 per treatment in the US.