Secondary hypothyroidism
Secondary Hypothyroidism
Secondary hypothyroidism (pronounced as sek-uh n-der-ee hahy-puh-thahy-roi-diz-uhm) is a rare condition that occurs when the pituitary gland fails to produce enough thyroid-stimulating hormone (TSH), which is necessary for the thyroid gland to produce and release thyroid hormones.
Etymology
The term "secondary hypothyroidism" is derived from the Latin word "secundus" meaning "second" and the Greek words "hypo" meaning "under", "thyreos" meaning "shield", and "eidos" meaning "form". This refers to the condition's nature of being a secondary or indirect result of a primary condition affecting the pituitary gland, leading to an underactive thyroid gland.
Causes
Secondary hypothyroidism is usually caused by disorders of the pituitary gland such as pituitary adenomas (noncancerous tumors) or due to damage to the pituitary gland from radiation therapy, surgery, or diseases such as tuberculosis or sarcoidosis. It can also be caused by a decrease in the blood supply to the pituitary gland.
Symptoms
Symptoms of secondary hypothyroidism are similar to those of primary hypothyroidism and may include fatigue, weight gain, cold intolerance, constipation, and depression. However, unlike primary hypothyroidism, secondary hypothyroidism may also be associated with other symptoms related to pituitary dysfunction such as menstrual irregularities and sexual dysfunction.
Diagnosis
Diagnosis of secondary hypothyroidism involves blood tests to measure levels of TSH and thyroid hormones. Imaging tests such as MRI or CT scan may also be used to check for abnormalities in the pituitary gland.
Treatment
Treatment for secondary hypothyroidism typically involves hormone replacement therapy to restore normal thyroid hormone levels. Treatment of the underlying pituitary disorder is also necessary.
Related Terms
- Primary Hypothyroidism
- Tertiary Hypothyroidism
- Hypopituitarism
- Thyroid-Stimulating Hormone
- Thyroid Hormones
External links
- Medical encyclopedia article on Secondary hypothyroidism
- Wikipedia's article - Secondary hypothyroidism
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