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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 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...

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...

Synthesis and Regulation of Thyroid Hormones

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Functions of Thyroid Hormones

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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.
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The Thyroid Gland

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Related Experiment Video

Updated: Jul 19, 2026

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

The association between hypoechogenicity or irregular echo pattern at thyroid ultrasonography and thyroid function in

Pernille Vejbjerg¹, Nils Knudsen, Hans Perrild

¹Department of Internal Medicine I, Bispebjerg Hospital, University of Copenhagen, Bispebjerg Bakke 23, 2400 Copenhagen NV, Denmark. pervej01@glostruphosp.kbhamt.dk

European Journal of Endocrinology

|September 23, 2006

Summary

Thyroid ultrasound (US) showing decreased echogenicity is linked to higher thyroid-stimulating hormone (TSH) levels, even in those without overt thyroid disease. This suggests US can detect early or subclinical thyroid dysfunction.

Related Experiment Videos

Last Updated: Jul 19, 2026

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

Area of Science:

Endocrinology
Radiology
Internal Medicine

Background:

Overt hypothyroidism is associated with decreased thyroid echogenicity on ultrasound (US).
The relationship between thyroid echogenicity and function in the general population without overt thyroid disease is less understood.

Purpose of the Study:

To investigate the association between thyroid echogenicity/irregular echo patterns and thyroid function in the general adult population.
To determine if thyroid US can serve as an early indicator of thyroid dysfunction.

Main Methods:

A cross-sectional study of 4649 randomly selected adult subjects.
Serum thyroid-stimulating hormone (TSH), thyroid hormones, and autoantibodies were analyzed.
Thyroid ultrasonography (US) was performed on all participants.

Main Results:

Decreased thyroid echogenicity was associated with higher mean TSH levels (1.65 mU/l vs. 1.21 mU/l, P<0.0001).
Markedly decreased echogenicity showed a stronger association with elevated TSH (4.20 mU/l, P<0.0001).
Decreased echogenicity and irregular echo patterns were more prevalent in subjects with high TSH levels and were associated with a higher risk of thyroid autoantibodies.

Conclusions:

Hypoechogenicity on thyroid US is associated with higher serum TSH levels, even in individuals without overt thyroid disease.
Decreased echogenicity may be an early sign of thyroid dysfunction.
Thyroid US, including assessment of echo patterns, may aid in detecting early and subclinical thyroid dysfunction.