Hyperthyroidism

Hypothyroidism or hyperthyroidism is a disease of the thyroid gland, which is characterized by overactive thyroid gland resulting in thyrotoxicosis. Thyrotoxicosis is the result clinical, physiological, and biochemical resulting from excessive thyroid hormone: thyroxine or tetraiodothyronine (T4), triiodothyronine (T3) or both. Generally patients with hyperthyroidism have thyrotoxicosis but the reverse is not always the case. The excess of these hormones in circulation causes the body meet with oversupply of these. The thyroid hormone is important at a cellular level, affecting nearly every type of tissue in the human body.

In excess, it both stimulates the metabolism and excess exacerbates the effects of the sympathetic nervous system, causing acceleration of various body systems and symptoms that appear as an overdose of epinephrine (adrenaline). May experience a variety of clinical manifestations such as tachycardia, weight loss, nervousness and tremors.

The main causes of hyperthyroidism is Graves' disease, thyroid autonomy and increased thyroid hormones as a result of drugs.

In extreme cases of a crisis superfunção life threatening speech is a "thyrotoxic crisis" (synonym for thyrotoxicosis). The opposite of hyperthyroidism, lack of thyroid hormones is known as hypothyroidism.

Symptoms

• Hyperactivity

• Intolerance to heat

• Growth of exaggerated edges

Diagnosis

• It is necessary for the determination of serum TSH and T4. It is the common finding of low levels of TSH associated with normal levels of T4 (subclinical hyperthyroidism). In the case of hyperthyroidism due to increase secretion of TSH (hyperthyroidism, central and pituitary) are high levels of T4 associated with normal or high levels of TSH.