MedlinePlus Medical Encyclopedia: Thyroid diseases

Skip navigation


Medical Encyclopedia
Other encyclopedia topics:	A-Ag Ah-Ap Aq-Az B-Bk Bl-Bz C-Cg Ch-Co Cp-Cz D-Di Dj-Dz E-Ep Eq-Ez F G H-Hf Hg-Hz I-In Io-Iz J K L-Ln Lo-Lz M-Mf Mg-Mz N O P-Pl Pm-Pz Q R S-Sh Si-Sp Sq-Sz T-Tn To-Tz U V W X Y Z 0-9

Thyroid diseases

Contents of this page:
Illustrations	Definition

Illustrations

Endocrine glands

Primary and secondary hypothyroidism

Brain-thyroid link

Thyroid gland

Definition Return to top

The thyroid gland is located in the base of the neck on both sides of the lower part of the voice box (larynx) and upper part of the wind pipe (trachea). The thyroid produces chemicals (hormones) that help the body control metabolism. Thyroid hormone is also produced in response to another hormone secreted by the pituitary gland.

There are four main types of thyroid disease:

Hyperthyroidism -- too much thyroid hormone
Hypothyroidism -- too little thyroid hormone
Benign (non-cancerous) thyroid disease
Thyroid cancer

For information about a specific type of thyroid disease see one of the following:

Update Date: 10/25/2006

Updated by: Robert Hurd, M.D., Department of Biology, College of Arts and Sciences, Xavier University, Cincinnati, OH. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 1997-2008, A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.