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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...
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...
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...
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...
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...

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Related Experiment Video

Updated: May 18, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Thyroid function and serum electrolytes: does an association really exist?

Christoph Schwarz1, Alexander Benedikt Leichtle, Spiros Arampatzis

  • 1Department of Nephrology, Medical University of Graz, Austria.

Swiss Medical Weekly
|September 19, 2012
PubMed
Summary
This summary is machine-generated.

Thyroid disorders are linked to electrolyte imbalances, particularly affecting sodium, phosphate, calcium, magnesium, and potassium levels. These associations are most pronounced in cases of significant hypothyroidism or hyperthyroidism.

Related Experiment Videos

Last Updated: May 18, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Area of Science:

  • Endocrinology
  • Internal Medicine
  • Clinical Chemistry

Background:

  • Thyroid hormones regulate essential bodily functions.
  • Thyroid dysfunction is a potential contributor to electrolyte disturbances.
  • Limited data exists on the specific associations between thyroid function and electrolyte disorders.

Purpose of the Study:

  • To investigate the relationship between thyroid function markers and serum electrolyte levels.
  • To identify specific electrolyte imbalances associated with varying thyroid states.

Main Methods:

  • Retrospective analysis of 9,012 patients admitted to an emergency department.
  • Inclusion criteria: measurements of thyroid function (TSH, fT3, fT4) and electrolytes.
  • Data analysis correlated thyroid-stimulating hormone (TSH) and free T3 (fT3) levels with serum electrolytes.

Main Results:

  • Elevated TSH levels were associated with significantly lower serum sodium and higher phosphate levels.
  • Significant correlations were observed between TSH and serum calcium and magnesium.
  • Hyponatremia, hypokalemia, and hyperkalemia were more prevalent in patients with elevated TSH.
  • Free T3 (fT3) levels showed a significant correlation with serum calcium.

Conclusions:

  • A clear association exists between thyroid function and electrolyte disorders.
  • These electrolyte disturbances appear most relevant in cases of marked hypothyroidism or hyperthyroidism.