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Related Concept Videos

Hyperthyroidism I: Introduction01:25

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 Hormones01:20

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...
Hyperthyroidism II: Pathophysiology01:27

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...
Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
Hypothyroidism II: Pathophysiology01:23

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...
Goiter01:27

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...

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Related Experiment Video

Updated: May 10, 2026

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
04:14

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

Published on: October 6, 2023

[Thyroid hormone treatment].

R Gärtner1

  • 1Medizinische Klinik IV der Universität München. roland.gaertner@med.uni-muenchen.de

Deutsche Medizinische Wochenschrift (1946)
|June 27, 2013
PubMed
Summary
This summary is machine-generated.

Primary hypothyroidism is common, but treatment timing for subclinical cases remains debated. Levothyroxine is standard, though some patients may benefit from combination therapy due to genetic factors affecting thyroid hormone activation.

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A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function
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Last Updated: May 10, 2026

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
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A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function
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A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function

Published on: October 6, 2023

Area of Science:

  • Endocrinology
  • Thyroidology

Background:

  • Autoimmune thyroiditis causing hypothyroidism is a prevalent endocrine disorder.
  • Diagnosis of hypothyroidism is straightforward, but treatment initiation for subclinical cases is debated.

Observation:

  • Overt hypothyroidism (low FT4, high TSH) requires levothyroxine replacement.
  • Subclinical hypothyroidism (TSH 4-10 mU/L, normal FT4) treatment depends on etiology and symptoms.
  • Levothyroxine, a prohormone, is converted to active triiodothyronine (T3) via deiodination.

Findings:

  • Some patients experience suboptimal response to levothyroxine, potentially linked to type 2 deiodinase gene polymorphism affecting intracellular T3 levels.
  • Levothyroxine dosage needs adjustment during pregnancy (increased demand) and in patients with malabsorption issues (e.g., acid blockers, atrophic gastritis).
  • TSH suppression is indicated for high-risk differentiated thyroid cancer post-thyroidectomy; low-normal TSH is targeted for occult papillary thyroid carcinoma.

Implications:

  • Personalized treatment strategies may be needed for subclinical hypothyroidism, considering genetic factors and patient-reported symptoms.
  • Careful monitoring and dosage adjustments are crucial for levothyroxine therapy, especially in pregnant women and those with gastrointestinal conditions.
  • Risk stratification is essential for determining appropriate TSH targets after thyroidectomy for thyroid cancer.