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Related Concept Videos

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...
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...
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...
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: May 16, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Hypothyroidism.

Michelle So1, Richard J MacIsaac, Mathis Grossmann

  • 1Austin Health and Northern Health, Melbourne, Victoria, Australia. mjmso@yahoo.com

Australian Family Physician
|November 13, 2012
PubMed
Summary
This summary is machine-generated.

Hypothyroidism, often caused by autoimmune thyroiditis, is diagnosed using thyroid stimulating hormone (TSH) tests. Treatment involves thyroxine replacement, with iodine supplementation recommended for pregnant women.

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Area of Science:

  • Endocrinology
  • Internal Medicine

Background:

  • Hypothyroidism is a prevalent endocrine disorder, disproportionately affecting women and older adults.
  • Autoimmune chronic lymphocytic thyroiditis is the leading cause in Western populations.

Purpose of the Study:

  • To provide a comprehensive overview of hypothyroidism.
  • To detail its causes, clinical presentation, diagnostic methods, and treatment strategies.

Main Methods:

  • Initial screening involves thyroid stimulating hormone (TSH) assays.
  • Diagnosis of autoimmune thyroiditis is confirmed via thyroid peroxidase antibody testing.
  • Thyroid ultrasonography is reserved for suspected structural abnormalities; radionucleotide scanning is not indicated.

Main Results:

  • Thyroxine replacement (1.6 μg/kg lean body weight daily) is the standard treatment.
  • Poor treatment response may stem from non-compliance, drug interactions, or malabsorption.
  • The role of thyroxine in cases with elevated TSH and normal thyroid hormones remains debated.

Conclusions:

  • Routine iodine supplementation is advised for women planning pregnancy.
  • Close monitoring and specialist consultation are necessary for periconceptual or pregnant women with elevated TSH.
  • Accurate diagnosis and management are crucial for patient outcomes.