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Hyperthyroidism I: Introduction

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...

Synthesis and Regulation of Thyroid Hormones

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...

Hyperthyroidism II: Pathophysiology

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...

Graves' Disease I: Introduction

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence...

Graves Disease II: Pathophysiology

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor,...

Hypothyroidism II: Pathophysiology

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...

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Related Experiment Video

Updated: Apr 24, 2026

Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model

Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model

Published on: October 6, 2023

[Pregnancy and thyroid disorders].

L Bricaire¹, L Groussin¹

¹Service d'endocrinologie, hôpital Cochin, AP-HP, université Paris V, 27, rue du Faubourg-Saint-Jacques, 75014 Paris, France.

La Revue De Medecine Interne

|September 8, 2014

Summary

Thyroid disorders are common in pregnant women. Proper management of hypothyroidism and hyperthyroidism is crucial to prevent complications for both mother and fetus, with thyroid nodules and cancer requiring standard follow-up.

Area of Science:

Endocrinology
Obstetrics
Reproductive Health

Context:

Thyroid disorders present unique challenges during pregnancy.
Recent guidelines from the Endocrine Society and American Thyroid Association address management.
Iodine deficiency in regions like France exacerbates thyroid issues in pregnancy.

Purpose:

To summarize current understanding and management of thyroid disorders in pregnant women.
To highlight the importance of timely diagnosis and treatment for maternal and fetal well-being.
To outline specific approaches for hypothyroidism, hyperthyroidism, thyroid nodules, and cancer during gestation.

Summary:

Hypothyroidism requires careful substitution therapy to prevent adverse fetal outcomes.
Maternal hyperthyroidism necessitates specific monitoring and potential treatment to mitigate risks.

Keywords:

Grossesse Pathologies thyroïdiennes Pregnancy Thyroid disorders

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

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Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

Published on: February 9, 2024

Related Experiment Videos

Last Updated: Apr 24, 2026

Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model

Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model

Published on: October 6, 2023

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

Published on: February 9, 2024

Thyroid nodules and cancer management in pregnancy generally aligns with non-pregnant protocols, often involving multidisciplinary teams.

Impact:

Ensuring optimal maternal and fetal outcomes through evidence-based thyroid disorder management.
Informing healthcare providers on updated guidelines for thyroid health during pregnancy.
Reducing the incidence of preventable complications associated with thyroid dysfunction in gestation.