What is a thyroid? What does it do?

What is T4?

Thyroxine (T4) is produced by the thyroid gland under regulation from the hypothalamus and pituitary gland. The feedback loop signals to the hypothalamus in to release thyrotropin-releasing hormone, which then stimulates the pituitary gland to release the thyroid stimulating hormone.

What is T3?

T3 is a second thyroid hormone that is produced by the thyroid gland, but also in other tissues through deiodination (enzymatic conversion) of T4. T3 helps maintain muscle control, brain function and development, heart and digestive functions. It also plays a role in the body’s metabolic rate and the maintenance of bone health.

Problems Associated with T3 and T4?

Having too much T3 in the bloodstream, often results from overactivity in the thyroid gland, or hyperthyroidism. Hyperthyroidism occurs in conditions such as Graves’ disease, inflammation of the thyroid or a thyroid nodule. Signs of high, overactive thyroid activity include weight loss, increased appetite, palpitations, irregular menstrual cycle, tiredness, irritability, and hair thinning. Hyperthyroidism may also occur when supplements with too much T3 are ingested.

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Conversely, 

Hypothyroidism is a condition that occurs if the thyroid gland does not produce enough of the thyroid hormone. This may be due to autoimmune conditions, such as Hashimoto’s thyroiditis or certain medications. Hypothyroidism may also occur in pituitary dysfunction, such as pituitary tumors or inflammation.

Hypothyroidism tends to run in families and more common in adults, as well as women. Symptoms may include tiredness, mental depression, feeling cold, weight gain, dry skin, constipation, and menstrual irregularities.

 

Consider asking your healthcare provider:

• Are my thyroid hormone levels "normal"?

• What test should I have to check my thyroid function byond a TSH?

• Could my current symptoms be due to thyroid hormone abnormalities?

• If my thyroid hormone levels are too high or too low - What should I do? 

• Therefore, IF your TSH is normal ( yet you don't feel normal), please come see us. We DO know how to address this. We can help.

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