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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...

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...

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...

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 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...

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Updated: May 12, 2026

"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach

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Recurrent pregnancy loss in patients with thyroid dysfunction.

Debanjali Sarkar¹

¹Department of Obstetrics & Gynaecology, MGM Medical College, Bihar, India.

Indian Journal of Endocrinology and Metabolism

|April 9, 2013

Summary

This summary is machine-generated.

Thyroid dysfunction significantly impacts female reproduction, increasing risks of infertility, miscarriage, and adverse pregnancy outcomes. Early thyroid function testing is crucial for women experiencing reproductive issues or pregnancy loss.

Keywords:

Recurrent pregnancy thyroid autoimmunity thyroid disorder

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"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach

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Multiplexed Fluorescent Immunohistochemical Staining of Four Endometrial Immune Cell Types in Recurrent Miscarriage

Multiplexed Fluorescent Immunohistochemical Staining of Four Endometrial Immune Cell Types in Recurrent Miscarriage

Published on: August 4, 2021

Area of Science:

Reproductive Endocrinology
Thyroidology
Women's Health

Background:

Thyroid disturbances are prevalent in women of reproductive age, affecting reproductive physiology and pregnancy outcomes.
Endocrine factors contribute to an estimated 8-12% of pregnancy losses.
Autoimmune thyroid disease affects 4% of young females, with 15% at risk due to thyroid antibodies.

Purpose of the Study:

To review the impact of thyroid dysfunction on human reproduction.
To highlight knowledge gaps concerning thyroid dysfunction's role in reproductive health.
To emphasize the relevance of thyroid disorders in reproductive dysfunction algorithms.

Main Methods:

Literature review focusing on endocrinological events in pregnancy maintenance.
Analysis of data linking thyroid immunity to infertility, miscarriage, and pregnancy complications.
Examination of the effects of hypothyroidism and hyperthyroidism during pregnancy.

Main Results:

Subclinical hypothyroidism and thyroid antibodies elevate risks of pre-eclampsia, perinatal mortality, and miscarriage.
Minimal hypothyroidism can lead to increased miscarriage rates, fetal death, and adverse offspring cognitive development.
Hyperthyroidism during pregnancy also presents adverse consequences.

Conclusions:

Women with subclinical hypothyroidism or thyroid antibodies face higher complication risks during pregnancy.
Thyroid function screening is recommended for women with a history of fetal loss or menstrual irregularities.
Practitioners should consider thyroid disorders as a potential cause of recurrent pregnancy loss.