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Goitre
Other names	Goiter
Diffuse hyperplasia of the thyroid
Specialty	Endocrinology
Causes	Iodine deficiency, autoimmune disease, tumors, cyanide poisoning

A goitre (British English) or goiter (American English) is a swelling in the neck resulting from an enlarged thyroid gland.^[1][2] A goitre can be associated with a thyroid that is not functioning properly.

Worldwide, over 90% of goitre cases are caused by iodine deficiency.^[3] The term is from the Latin gutturia, meaning throat. Most goitres are not cancerous (i.e., benign), though they may be potentially harmful. Women are affected more often than men.

A goitre can present as a palpable or visible enlargement of the thyroid gland at the base of the neck. A goitre, if associated with hypothyroidism or hyperthyroidism, may be present with symptoms of the underlying disorder. For hyperthyroidism, the most common symptoms are associated with adrenergic stimulation: tachycardia (increased heart rate), palpitations, nervousness, tremor, increased blood pressure and heat intolerance. Clinical manifestations are often related to hypermetabolism (increased metabolism), excessive thyroid hormone, an increase in oxygen consumption, metabolic changes in protein metabolism, immunologic stimulation of diffuse goitre, and ocular changes (exophthalmos).^[4] Hypothyroid people commonly have poor appetite, cold intolerance, constipation, lethargy and may undergo weight gain. However, these symptoms are often non-specific and make diagnosis difficult.^[5]

According to the WHO classification of goitre by palpation, the severity of goitre is currently graded as grade 0, grade 1, grade 2.^[6]

• 
  Goitre Class II, WHO grade 2
• 
  Goitre Class III, WHO grade 2

Worldwide, the most common cause for goitre is iodine deficiency, commonly seen in countries that scarcely use iodised salt. Selenium deficiency is also considered a contributing factor. In countries that use iodised salt, Hashimoto's thyroiditis is the most common cause.^[7] Goitre can also result from cyanide poisoning, which is particularly common in tropical countries where people eat the cyanide-rich cassava root as the staple food.^[8]

• Sarcoidosis
• Amyloidosis
• Hydatidiform mole
• Cysts
• Acromegaly
• Pendred syndrome

Goitre may be diagnosed via a thyroid function test.^[14]

Goitre is treated according to the cause. If the thyroid gland is producing an excess of thyroid hormones (T3 and T4), radioactive iodine is given to the patient to shrink the gland. If goitre is caused by iodine deficiency, small doses of iodide in the form of Lugol's iodine or KI solution are given. If the goitre is associated with an underactive thyroid, thyroid supplements are used as treatment. Sometimes a partial or complete thyroidectomy is required.^[20]

The discovery of iodine's importance in thyroid function and its role in preventing goitre marked a significant medical breakthrough. The introduction of iodised salt in the early 20th century became a key public health initiative, effectively reducing the prevalence of goitre in previously affected regions. This measure was one of the earliest and most successful examples of mass preventive health campaigns.^[21]

Goitre is more common among women, but this includes the many types of goitre caused by autoimmune problems, and not only those caused by simple lack of iodine.

Iodine mainly accumulates in the sea and in the topsoil. Before iodine enrichment programs, goitres were common in areas with repeated flooding or glacial activities, which erodes the topsoil. It is endemic in populations where the intake of iodine is less than 10 μg per day.^[23]

Examples of such regions include the alpine regions of Southern Europe (such as Switzerland), the Himalayans, and the Great Lakes basin. As reported in 1923, all the domestic animals had goitre in some of the glacial valleys of Southern Alaska, so severely in Pemberton Meadows that it was difficult to raise young animals there.^[24]

Chinese physicians of the Tang dynasty (618–907) were the first to successfully treat patients with goitre by using the iodine-rich thyroid gland of animals such as sheep and pigs—in raw, pill, or powdered form.^[25] This was outlined in Zhen Quan's (d. 643 AD) book, as well as several others.^[25] One Chinese book, The Pharmacopoeia of the Heavenly Husbandman, asserted that iodine-rich sargassum was used to treat goitre patients by the 1st century BC, but this book was written much later.^[25]

In the 12th century, Zayn al-Din al-Jurjani, a Persian physician, provided the first description of Graves' disease after noting the association of goitre and a displacement of the eye known as exophthalmos in his Thesaurus of the Shah of Khwarazm, the major medical dictionary of its time.^[26][27] The disease was later named after Irish doctor Robert James Graves, who described a case of goitre with exophthalmos in 1835. The German Karl Adolph von Basedow also independently reported the same constellation of symptoms in 1840, while earlier reports of the disease were also published by the Italians Giuseppe Flajani and Antonio Giuseppe Testa, in 1802 and 1810 respectively,^[28] and by the English physician Caleb Hillier Parry (a friend of Edward Jenner) in the late 18th century.^[29]

Paracelsus (1493–1541) was the first person to propose a relationship between goitre and minerals (particularly lead) in drinking water.^[30] Iodine was later discovered by Bernard Courtois in 1811 from seaweed ash.^[31]

Goitre was previously common in many areas that were deficient in iodine in the soil. For example, in the English Midlands, the condition was known as Derbyshire Neck. In the United States, goitre was found in the Appalachian,^[32][33] Great Lakes, Midwest, and Intermountain regions. The condition is now practically absent in affluent nations, where table salt is supplemented with iodine. However, it is still prevalent in India, China,^[34] Central Asia, and Central Africa.

Goitre had been prevalent in the alpine countries for a long time. Switzerland reduced the condition by introducing iodised salt in 1922. Bavarian folk dress (tracht) worn in the Miesbach and Salzburg regions, which appeared in the 19th century, includes a choker, dubbed Kropfband (struma band), which was used to hide either the goitre or the remnants of goitre surgery.^[35]

In various regions around the world, particularly in mountainous areas, the prevalence of goitre was linked to iodine deficiency in the diet. For example, the Alps, the Himalayas, and the Andes had high rates of goitre due to the iodine-poor soil. In these regions, iodine deficiency led to widespread hormonal imbalances, particularly affecting thyroid function.^[36]

In the 1920s wearing bottles of iodine around the neck was believed to prevent goitre.^[37]

• David Marine conducted substantial research on the treatment of goitre with iodine.
• Endemic goitre
• Struma ovarii—a kind of teratoma
• Thyroid hormone receptor

• The dictionary definition of goitre at Wiktionary
• Media related to Goiters at Wikimedia Commons