The thyroid (from the Greek word for "shield", after its shape) is one of the larger endocrine glands in the body. It is a double-lobed structure located in the neck and produces hormones, principally thyroxine (T4) and triiodothyronine (T3), that regulate the rate of metabolism and affect the growth and rate of function of many other systems in the body. The hormone calcitonin is also produced and controls calcium blood levels. Iodine is necessary for the production of both hormones. Hyperthyroidism (overactive thyroid) and hypothyroidism (underactive thyroid) are the most common problems of the thyroid gland.

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Thyroid Disease Manager
Features a complete analysis of thyrotoxicosis, hypothyroidism, thyroiditis, nodules, cancer, and aspects of physiology.
eMedicine - Euthyroid Sick Syndrome
Discusses the abnormal findings on thyroid function tests that occur in the setting of a nonthyroidal illness (NTI) without preexisting hypothalamic-pituitary and thyroid gland dysfunction.
eMedicine Health - Thyroid Problems
Consumer health information. Lists the causes, symptoms, tests, and treatment of thyroid illness.
The Hormone Foundation: Thyroid Disorders
Contains an overview on hyperthyroidism, hypothyroidism, thyroid nodules, lifestyle issues, and prevention.
International Thyroid Awareness Week
To raise awareness and educate people about the critical role the thyroid gland plays. Available in a variety of languages.
MedicineNet - Thyroid Overview
Find a number of articles on gland conditions and diseases. Including medications, doctor's views, and responses.
Merck Manual - Overview of the Thyroid Gland
Provides several chapters on the various types of conditions and diseases.
Patient-centered resource by a physician from Toronto. Discusses the various diseases and their related complications.
New York Thyroid Center
Medical care, research, and education for patients via Columbia University Medical Center.
Thyroid - Wikipedia
Article covers anatomy, physiology, diseases, diagnosis, and treatment.
Thyroid and Parathyroid Glands
Presents the chemistry, synthesis, and secretion of thyroid hormones. Covers hamburger thyrotoxicosis, pregnancy, fetal development, and sodium-iodide.
Thyroid Awareness
Resource for patients, physicians, media, and guidelines. By the AACE.
Thyroid Disease
Pathology lecture notes and pictures of goiter, including cancer.
Thyroid Research
A peer-reviewed, online journal that encompasses all aspects of thyroid hormones and thyroid diseases and their interaction with cardiovascular, pulmonary, gastroenterological, metabolic and nervous systems.
Thyroid 'Risk From Pre-Eclampsia'
Pregnant women with the potentially dangerous condition may be more at risk of thyroid problems, research suggests. From BBC News. (November 18, 2009)
Sunscreen Thyroid Effect Concerns
Fears have been raised about the potential of sunscreens to disrupt the balance of thyroid hormones. From BBC News. (June 10, 2006)

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