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==Classification==
==Classification==
Hypothyroidism is often classified by the organ of origin:<ref>http://www.umm.edu/patiented/articles/what_causes_hypothyroidism_000038_2.htm</ref><ref>http://www.pathology.vcu.edu/education/endocrine/endocrine/pituitary/diseases.html</ref>
Hypothyroidism may be classified according to TSH levels into 3 different sub types: Primary hypothyroidism, subclinical hypothyroidism, and central hypothyroidism


{| class="wikitable"
{| class="wikitable"
| '''Type''' || '''Origin''' || '''Description'''  
| colspan="2" |'''Type'''
|TSH level|| '''Origin'''  
|-
| colspan="2" |''Primary hypothyroidism''
|↑↑|| rowspan="2" | [[thyroid gland]]
|-
| colspan="2" |Subclinical hypothyroidism
|↑
|-
| rowspan="2" |Central hypothyroidism
| Secondary hypothyroidism
|↓|| [[pituitary gland]]
  |-  
  |-  
  | ''Primary hypothyroidism'' || [[thyroid gland]] || The most common forms include [[Hashimoto's thyroiditis]] (an [[autoimmune]] disease) and [[radioiodine]] therapy for [[hyperthyroidism]].
  | Tertiary hypothyroidism (hypothalamic-pituitary-axis hypothyroidism)  
 
|↓|| [[hypothalamus]]  
|-  
| ''Secondary hypothyroidism'' || [[pituitary gland]] || Occurs if the pituitary gland does not create enough [[thyroid stimulating hormone]] (TSH, [[Thyrotropin]]) to induce the thyroid gland to create a sufficient quantity of [[thyroxine]].  Although not every case of secondary hypothyroidism has a clear-cut cause, it is usually caused when the pituitary is damaged by a tumor, radiation, or surgery so that it is no longer able to instruct the thyroid to make enough hormone<ref name="ATA">{{cite book |author=American Thyroid Association (ATA) |title=Hypothyroidism Booklet |year=2003 |pages=6 |url=http://www.thyroid.org/patients/brochures/Hypothyroidism%20_web_booklet.pdf#search=%22hypothyroidism%22 |format=PDF}}</ref>
|-
| ''Tertiary hypothyroidism'', also called ''hypothalamic-pituitary-axis hypothyroidism'' || [[hypothalamus]] || Results when the hypothalamus fails to produce sufficient [[TRH]].
|}
|}


==References==
==References==
{{reflist|2}}
{{reflist|2}}
[[Category:Endocrinology]]
{{WS}}
{{WH}}

Latest revision as of 16:05, 6 July 2017

Hypothyroidism Main page

Patient Information

Overview

Classification

Primary hypothyroidism
Hashimoto's thyroiditis
Secondary hypothyroidism
Tertiary hypothyroidism

Differentiating different causes of hypothyroidism

Screening

Diagnosis

History and symptoms

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Classification

Hypothyroidism may be classified according to TSH levels into 3 different sub types: Primary hypothyroidism, subclinical hypothyroidism, and central hypothyroidism

Type TSH level Origin
Primary hypothyroidism ↑↑ thyroid gland
Subclinical hypothyroidism ↑
Central hypothyroidism Secondary hypothyroidism ↓ pituitary gland
Tertiary hypothyroidism (hypothalamic-pituitary-axis hypothyroidism) ↓ hypothalamus

References

Template:WS Template:WH

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