Primary and secondary hypothyroidism: MedlinePlus Medical Encyclopedia Image

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Primary and secondary hypothyroidism



	Hypothyroidism is a decreased activity of the thyroid gland which may affect all body functions. The rate of metabolism slows causing mental and physical sluggishness. The most severe form of hypothyroidism is myxedema, a medical emergency. Hypothyroidism can be caused by a problem with the thyroid itself (primary), or by the malfunction of the pituitary gland or hypothalamus (secondary).

Update Date: 6/24/2009

Updated by: David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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