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Hypothyroidism is classified as either primary, secondary, or tertiary. Primary hypothyroidism is for when the cause is due to an abnormality of the thyroid gland, secondary hypothyroidism is when the cause is decreased thyroid-stimulating hormone levels, and tertiary hypothyroidism is when the cause is an inadequate amount of thyrotropin-releasing hormone being released.
The most common cause is thyroid carcinoma, a malignant tumor. Signs include weight loss, increased appetite, and enlargement of the thyroid gland. [100] Hypothyroidism is the most common endocrine disease in dogs. It can be caused by autoimmune destruction (lymphocytic thyroiditis) or idiopathic atrophy of the thyroid gland. [101]
Hashimoto's thyroiditis is an autoimmune disorder in which the thyroid gland is infiltrated by the lymphocytes B cell and T cells. These progressively destroy the thyroid gland. [65] In this way, Hasimoto's thyroiditis may have occurred insidiously, and only be noticed when thyroid hormone production decreases, causing symptoms of ...
Thyroid disease is a medical condition that affects the structure and/or function of the thyroid gland. The thyroid gland is located at the front of the neck and produces thyroid hormones [1] that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ. These hormones normally act in the body to ...
Cortisol is a hormone produced in the adrenal glands. Cortisol is stored in these glands and released to help prepare the body for a fight-or-flight response. Cortisol makes the body mobilise fat and sugar stores and retain sodium and water by adjusting the metabolism. This allows the body to easily access stored resources.
There may be symptoms of thyroid overactivity, such as weight loss, a fast or irregular heart rate, tremor, and perspiration; [1] [2] but such symptoms occur in only half of all cases. [5] The most common type of hyperthyroidism, Graves' disease , may additionally cause eye problems ( Graves' ophthalmopathy ) and skin changes of the legs ...
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The thyroid ima artery (thyroidea ima artery, arteria thyroidea ima, thyroid artery of Neubauer or the lowest thyroid artery) is an artery of the head and neck.It is an anatomical variant that, when present, supplies blood to the thyroid gland primarily, or the trachea, the parathyroid gland and the thymus gland (as thymica accessoria) in rare cases.
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