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Related Concept Videos

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...
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...
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...
Graves Disease II: Pathophysiology01:24

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: Introduction01:28

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...
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...

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Related Experiment Video

Updated: Jun 2, 2026

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration
10:19

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration

Published on: November 10, 2014

Update on subclinical hyperthyroidism.

Ines Donangelo1, Glenn D Braunstein

  • 1Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.

American Family Physician
|April 29, 2011
PubMed
Summary
This summary is machine-generated.

Subclinical hyperthyroidism, characterized by low thyroid-stimulating hormone, may increase risks for atrial fibrillation and bone loss. Further research is needed to confirm these associations and evaluate treatment effectiveness.

Related Experiment Videos

Last Updated: Jun 2, 2026

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration
10:19

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration

Published on: November 10, 2014

Area of Science:

  • Endocrinology
  • Thyroid Disorders
  • Cardiovascular Health

Background:

  • Subclinical hyperthyroidism involves suppressed TSH with normal thyroid hormones.
  • Causes include Graves' disease, toxic goiter, or excessive thyroid hormone therapy.
  • Progression to overt hyperthyroidism is more likely with undetectable TSH levels.

Purpose of the Study:

  • To review the associations of subclinical hyperthyroidism with various health outcomes.
  • To highlight the need for further research on treatment efficacy and screening recommendations.

Main Methods:

  • Literature review of studies on subclinical hyperthyroidism.
  • Analysis of associations with cardiovascular effects, bone density, and other parameters.
  • Identification of gaps in evidence, particularly regarding treatment benefits.

Main Results:

  • Subclinical hyperthyroidism is linked to increased atrial fibrillation risk in the elderly.
  • Associated with decreased bone mineral density in postmenopausal women.
  • Lesser evidence suggests cardiovascular effects (heart rate, left ventricular mass) and bone turnover markers.

Conclusions:

  • The effectiveness of treating subclinical hyperthyroidism to prevent associated morbidities remains uncertain.
  • Associations with quality of life, cognition, and mortality are controversial.
  • Prospective trials are essential to guide screening and treatment decisions in asymptomatic populations.