Is thyroid hormone a steroid or protein

The release of too much thyroxine in the bloodstream is known as thyrotoxicosis . This may be caused by overactivity of the thyroid gland ( hyperthyroidism ), as in Graves' disease , inflammation of the thyroid or a benign tumour. Thyrotoxicosis can be recognised by a goitre , which is a swelling of the neck due to enlargement of the thyroid gland. Other symptoms of thyrotoxicosis include intolerance to heat, weight loss, increased appetite, increased bowel movements, irregular menstrual cycle , rapid or irregular heartbeat, palpitations, tiredness, irritability, tremor, hair thinning/loss and retraction of the eyelids resulting in a ‘staring’ appearance.

EndocrineWeb: How Your Thyroid Works  
: Hyperthyroidism  
: Hypothyroidism 
KidsHealth: Thyroid Disease 
American Association of Clinical Endocrinologists: About Your Thyroid 
Hormone Health Network: Thyroid Disorders
American Thyroid Association: Patients & The Public - Thyroid Information 
American Thyroid Association: Thyroid Function Tests 
American Thyroid Association: Frequently Asked Questions - Thyroid Disease  
National Endocrine and Metabolic Diseases Information Service: Hyperthyroidism

The production of thyroxine and triiodothyronine is primarily regulated by thyroid-stimulating hormone (TSH), released by the anterior pituitary gland. TSH release in turn is stimulated by thyrotropin releasing hormone (TRH), released in a pulsatile manner from the hypothalamus . [38] The thyroid hormones provide negative feedback to the thyrotropes TSH and TRH: when the thyroid hormones are high, TSH production is suppressed. This negative feedback also occurs when levels of TSH are high, causing TRH production to be suppressed. [39]

Reference ranges for TSH may vary slightly, depending on the method of analysis, and do not necessarily equate to cut-offs for diagnosing thyroid dysfunction. In the UK, guidelines issued by the Association for Clinical Biochemistry suggest a reference range of - mIU/mL. [16] The National Academy of Clinical Biochemistry (NACB) stated that it expected the reference range for adults to be reduced to – µIU/mL, because research had shown that adults with an initially measured TSH level of over µIU/mL had "an increased odds ratio of developing hypothyroidism over the [following] 20 years, especially if thyroid antibodies were elevated". [17]

Is thyroid hormone a steroid or protein

is thyroid hormone a steroid or protein

Reference ranges for TSH may vary slightly, depending on the method of analysis, and do not necessarily equate to cut-offs for diagnosing thyroid dysfunction. In the UK, guidelines issued by the Association for Clinical Biochemistry suggest a reference range of - mIU/mL. [16] The National Academy of Clinical Biochemistry (NACB) stated that it expected the reference range for adults to be reduced to – µIU/mL, because research had shown that adults with an initially measured TSH level of over µIU/mL had "an increased odds ratio of developing hypothyroidism over the [following] 20 years, especially if thyroid antibodies were elevated". [17]

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