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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...

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...

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 receptors...

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 iodine is then...

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, and heat...

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 in...

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Related Experiment Video

Updated: May 31, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Hypothyroidism and thyroid substitution: historical aspects.

J Lindholm¹, P Laurberg

¹Department of Endocrinology, Aarhus University Hospital, 9000 Aalborg, Denmark.

Journal of Thyroid Research

|July 16, 2011

Summary

The history of hypothyroidism reveals significant medical advancements, from early descriptions of myxedema to understanding autoimmune thyroiditis as a primary cause and developing effective treatments.

Area of Science:

Endocrinology
Medical History
Thyroidology

Background:

The late 19th century marked a pivotal era in understanding the thyroid gland, transitioning from a rudimentary structure to a key organ implicated in specific diseases.
Key discoveries included the importance of iodine and the description of Graves-Basedow's disease, alongside rapid surgical advancements.
Early observations linked thyroidectomy outcomes to cretinism, paving the way for recognizing hypothyroidism.

Purpose of the Study:

To provide a concise historical overview of hypothyroidism.
To trace the evolution of understanding and treatment of hypothyroidism.
To highlight key milestones in thyroidology and endocrinology.

Main Methods:

Historical literature review.

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Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

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Published on: February 9, 2024

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Last Updated: May 31, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

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Published on: March 17, 2023

Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

Published on: February 9, 2024

Analysis of seminal medical observations and discoveries from the late 19th and early 20th centuries.

Survey of the progression of diagnostic and therapeutic approaches to hypothyroidism.

Main Results:

The first documented case of hypothyroidism (myxedema) was in 1850, with effective treatments emerging less than 50 years later.
Autoimmune thyroiditis was identified as the leading cause of hypothyroidism in iodine-sufficient regions approximately a century after the initial description of myxedema.
Significant progress in surgical techniques and understanding of thyroid physiology occurred during this period.

Conclusions:

The historical trajectory of hypothyroidism demonstrates remarkable progress in medical science, from initial case descriptions to identifying etiological factors and effective interventions.
Understanding the thyroid gland's role in health and disease has been a cornerstone of endocrinological advancements.
Continued research has led to improved patient outcomes for hypothyroidism and related thyroid disorders.