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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Endocrinology

Recognizing Symptoms and Warning Signs of Thyroid Ectopia

At a Glance

Thyroid ectopia, commonly called a lingual thyroid, causes symptoms through hormone deficiency or physical throat crowding. Newborns may show signs of low thyroid hormone, while adults often experience difficulty swallowing, breathing issues, or a lump in the throat during hormonal changes.

Thyroid ectopia occurs when the thyroid gland—which normally sits in the lower front of the neck—develops in an unusual location, most commonly at the base of the tongue (lingual thyroid) [1][2]. Because this tissue is often the only functioning thyroid the person has, the symptoms it causes are usually related to either the body not having enough thyroid hormone or the physical presence of the tissue in a cramped space [3][4].

Symptoms are highly dependent on a person’s age and life stage. While some people remain asymptomatic (showing no symptoms) for years, others may notice changes as their body’s demand for thyroid hormone shifts [5][6].

Signs in Newborns and Infants

In the earliest stages of life, the primary concern is congenital hypothyroidism (CH)—a condition where the body does not have enough thyroid hormone from birth [7].

In most developed countries, standard newborn heel-prick screenings catch congenital hypothyroidism within days of birth, long before physical symptoms have a chance to develop [8]. This allows doctors to start treatment immediately, preventing long-term issues. However, if a case is missed or develops slightly later, parents should watch for:

  • Prolonged jaundice: A yellowing of the skin and eyes that lasts longer than the typical first week of life [7].
  • Lethargy: Extreme sleepiness or difficulty waking the baby for feedings [7].
  • Poor feeding: A weak suck or lack of interest in eating [7].
  • Growth and developmental delays: If left untreated, a lack of thyroid hormone can lead to intellectual disabilities and slowed physical growth [9][10].

Symptoms in Children and Adults

As children grow into adulthood, the physical location of the ectopic thyroid becomes a more common source of symptoms. This is often referred to as a mass effect, where the tissue physically crowds other structures in the throat [1].

Common warning signs include:

  • Dysphagia: Difficulty swallowing or a feeling that food is “getting stuck” [4][11].
  • Dyspnea: Shortness of breath or difficulty breathing, which may worsen when lying down [4].
  • Dysphonia: Changes in the voice, such as persistent hoarseness or a “muffled” quality [1][12].
  • Globus sensation: A persistent feeling of a lump or “foreign body” in the throat [1][13].
  • Snoring or Sleep Apnea: Obstructed breathing during sleep caused by the tissue blocking the airway [14].

Why Symptoms Change During Puberty and Pregnancy

Symptoms of thyroid ectopia often appear or worsen during periods of significant hormonal change, such as puberty or pregnancy [6][15]. During these times, the body’s metabolic demand for thyroid hormone increases significantly [14].

In response to this demand, the brain produces more Thyroid-Stimulating Hormone (TSH). This hormone signals the ectopic thyroid tissue to work harder, which can cause the tissue to undergo hyperplasia—an increase in size as the cells multiply to try and meet the body’s needs [6][16]. In pregnancy, high levels of the hormone hCG (human chorionic gonadotropin) can also mimic TSH and further stimulate the growth of the tissue [6]. This sudden enlargement can turn a previously “silent” lingual thyroid into one that causes noticeable breathing or swallowing issues [15][16].

Monitoring and Red Flags

While most ectopic thyroid tissue is benign (non-cancerous), there is a very small risk of malignant transformation (cancer developing in the tissue) [17][18]. Regular monitoring is essential to track the size of the mass and thyroid hormone levels [19].

You should contact your medical team if you notice:

  1. A sudden increase in the size of a known mass [17].
  2. Unexplained bleeding from the back of the throat [1].
  3. Rapidly worsening difficulty breathing or swallowing [4].
  4. New and persistent pain in the area of the mass [17].

Common questions in this guide

Can thyroid ectopia cause symptoms later if a newborn screen was normal?
Yes. Even if a newborn screening is normal, symptoms can develop later in life. As a child grows, the ectopic thyroid may enlarge to meet the body's increasing hormone demands, which can eventually cause throat discomfort, swallowing difficulty, or breathing issues.
Why do symptoms of a lingual thyroid worsen during puberty or pregnancy?
During periods of major hormonal change like puberty or pregnancy, the body requires more thyroid hormone. This causes the brain to overstimulate the ectopic thyroid tissue, making it grow larger and potentially causing new or worsening difficulty swallowing and breathing.
What physical throat symptoms should I watch for with an ectopic thyroid?
Common mass-effect warning signs include difficulty swallowing, a feeling of a lump or foreign object in the throat, persistent hoarseness, shortness of breath, and new onset of snoring or sleep apnea as the tissue crowds the airway.
When should I seek immediate medical care for a lingual thyroid?
You should seek immediate medical attention if you experience rapidly worsening difficulty breathing or swallowing, unexplained bleeding from the back of the throat, sudden enlargement of the mass, or new and persistent pain in the area.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.If my child's newborn screen was normal, is it still possible for thyroid ectopia to cause symptoms later?
  2. 2.What specific mass-effect symptoms (like snoring or voice changes) should we watch for as my child grows?
  3. 3.How do you expect puberty or future pregnancy to affect the size and function of this thyroid tissue?
  4. 4.If we notice the mass getting larger, what is the first step to determine if it is due to hormone demand or something else?
  5. 5.Is the ectopic tissue providing all of the body's necessary thyroid hormone, or is there a gland in the normal position as well?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (19)
  1. 1

    Hashimoto thyroiditis in a lingual thyroid: An interesting case.

    Dahal P, Parajuli S

    Clinical case reports 2023; (11(12)):e8273 doi:10.1002/ccr3.8273.

    PMID: 38033679
  2. 2

    The mutation screening in candidate genes related to thyroid dysgenesis by targeted next-generation sequencing panel in the Chinese congenital hypothyroidism.

    Zhang RJ, Yang GL, Cheng F, et al.

    Clinical endocrinology 2022; (96(4)):617-626 doi:10.1111/cen.14577.

    PMID: 34374102
  3. 3

    Thyroid Imaging in Infants.

    Goldis M, Waldman L, Marginean O, et al.

    Endocrinology and metabolism clinics of North America 2016; (45(2)):255-66.

    PMID: 27241963
  4. 4

    Lingual Thyroid with Subclinical Hypothyroidism in a Young Female.

    Thapa S, Khanal P

    Case reports in endocrinology 2021; (2021()):6693477 doi:10.1155/2021/6693477.

    PMID: 33564479
  5. 5

    Lingual Thyroid Unmasked by Acute Stroke: A Hidden Airway Emergency.

    Yoneoka Y, Tange A, Honda K, Ohara N

    Cureus 2025; (17(12)):e99162 doi:10.7759/cureus.99162.

    PMID: 41536379
  6. 6

    Thyroid scintigraphy and hybrid SPECT/CT in a rare case of dual ectopic thyroid.

    Jain S, Jain S, Singh D

    Journal of nuclear medicine technology 2022; doi:10.2967/jnmt.122.264508.

    PMID: 36041877
  7. 7

    Congenital hypothyroidism due to thyroid ectopy not detected in neonatal screening - case report.

    Stępniewska A, Wójcik M, B Starzyk J

    Pediatric endocrinology, diabetes, and metabolism 2023; (29(1)):53-56 doi:10.5114/pedm.2022.118322.

    PMID: 37218725
  8. 8

    Clinical Insight into Congenital Hypothyroidism Among Children.

    Korkmaz HA

    Children (Basel, Switzerland) 2025; (12(1)) doi:10.3390/children12010055.

    PMID: 39857886
  9. 9

    A Novel Pathogenic Variant in PAX8 Leads to Familial Congenital Hypothyroidism.

    França MM, Reeve L, Dumitrescu AM, et al.

    Thyroid : official journal of the American Thyroid Association 2022; (32(8)):1000-1002 doi:10.1089/thy.2022.0117.

    PMID: 35611983
  10. 10

    A young boy with ventricular arrhythmias and thyroid dysgenesis: two genes are not enough?

    Franceschi R, Maines E, Bellizzi M, et al.

    Archives of endocrinology and metabolism 2023; (67(1)):143-149.

    PMID: 36468928
  11. 11

    Tongue Base Ectopic Thyroid Tissue-Is It a Rare Encounter?

    Constantin BN, Marina TC, Eugen SH, et al.

    Medicina (Kaunas, Lithuania) 2023; (59(2)) doi:10.3390/medicina59020313.

    PMID: 36837515
  12. 12

    Lingual Thyroid Excision with Transoral Robotic Surgery.

    Ersoy Callıoglu E, Bozdemir K, Ulusoy B, et al.

    Case reports in otolaryngology 2015; (2015()):548582 doi:10.1155/2015/548582.

    PMID: 26064746
  13. 13

    Enlarged hemorrhagic lingual thyroid managed with transoral robotic surgery.

    Filarski CF, Levine B, Buttan A, et al.

    Endocrine 2021; (72(3)):923-927 doi:10.1007/s12020-020-02586-w.

    PMID: 33420947
  14. 14

    Navig ati ng o bs tructive lingual thyro i d coexist i ng with sub - clin i cal hyp othyro i dism: A c as e r epor t.

    Ishaq M, Hayat M, Fakhar U, et al.

    JPMA. The Journal of the Pakistan Medical Association 2025; (75(11)):1843-1845 doi:10.47391/JPMA.22581.

    PMID: 41418145
  15. 15

    A case report of coexistence of ectopic lingual thyroid with hypoplastic normal thyroid gland.

    Hashmi JZ, Ghafoor A, Hashmi AZ, et al.

    JPMA. The Journal of the Pakistan Medical Association 2020; (70(2)):351-353 doi:10.5455/JPMA.5118.

    PMID: 32063634
  16. 16

    Case report: surgical management of symptomatic pretracheal thyroid gland in a patient with dual ectopic thyroid.

    Saito M, Banno H, Ito Y, et al.

    Thyroid research 2022; (15(1)):23 doi:10.1186/s13044-022-00141-5.

    PMID: 36503622
  17. 17

    Lingual thyroid with severe hypothyroidism: A case report.

    Huang H, Lin YH

    Medicine 2021; (100(43)):e27612 doi:10.1097/MD.0000000000027612.

    PMID: 34713843
  18. 18

    Follicular carcinoma arising in a large ectopic lingual thyroid: a case report and review of literature.

    El Khatib N, Aoun C, Zbibo R, Abtar HK

    Journal of surgical case reports 2018; (2018(10)):rjy196 doi:10.1093/jscr/rjy196.

    PMID: 30364552
  19. 19

    Case report: - A case report on the management of symptomatic Lingual throid.

    Alebie HK, Tasew YZ, Seyoum FA, Negash LG

    International journal of surgery case reports 2024; (121()):110005 doi:10.1016/j.ijscr.2024.110005.

    PMID: 38971029

This page explains the symptoms and warning signs of thyroid ectopia for educational purposes only. It does not replace professional medical advice. Always consult your endocrinologist or pediatrician for a proper evaluation.

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