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Graves' Disease I: Introduction

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...

Graves Disease II: Pathophysiology

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: 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...

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...

Synthesis and Regulation of Thyroid Hormones

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: 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...

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Related Experiment Video

Updated: Jun 20, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Is lymphocytic (hashimoto) thyroiditis associated with suicide?

Stephen J Cina¹, Joshua A Perper

¹Broward County Medical Examiners Office, Fort Lauderdale, Fla, USA. scina@broward.org

The American Journal of Forensic Medicine and Pathology

|August 22, 2009

Summary

This study found lymphocytic thyroiditis occurred with similar frequency in suicide victims and motor vehicle accident controls. The autoimmune condition cannot reliably distinguish between suicide and accidental death cases.

Related Experiment Videos

Last Updated: Jun 20, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Area of Science:

Pathology
Endocrinology
Psychiatry

Background:

Lymphocytic (Hashimoto) thyroiditis involves thyroid inflammation and Hurthle cell metaplasia.
This autoimmune condition is linked to hypothyroidism and depression.
The relationship between thyroiditis and suicide warrants investigation.

Purpose of the Study:

To compare the incidence and severity of lymphocytic thyroiditis in suicide victims versus controls.
To determine if thyroiditis can serve as a histologic marker in forensic cases.

Main Methods:

Retrospective analysis of thyroid tissue from 81 suicide victims and 88 matched controls (motor vehicle accidents).
Histologic grading of lymphocytic inflammation and Hurthle cell metaplasia (0-3 scale).
Review of slides blinded to cause of death.

Main Results:

Overall, 8.8% of cases had moderate-to-marked inflammation (grades 2-3).
Suicide group: 7.4% incidence of grades 2-3 thyroiditis.
Control group: 10.2% incidence of grades 2-3 thyroiditis.
19% of suicide victims were on psychoactive medications vs. 6% of controls.

Conclusions:

Lymphocytic thyroiditis is diagnosed with similar frequency in suicide victims and accident controls.
Histologic evidence of thyroiditis is not a reliable indicator to differentiate suicide from accidental death.
Further research may explore the link between thyroiditis, depression, and suicide risk.