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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 ...
A study in 1987 transplanted thyroid tissue from affected cats into nude mice. The mice were administered levothyroxine, which suppresses thyroid-stimulating hormone. The thyroid cells remained in the hyperthyroid state. This study helped provide evidence for thyroid dysfunction as the cause rather than thyroid stimulation. [2]
Low levels of thyroid hormones can lead to symptoms including fatigue, weight gain, cold intolerance, dry, flakey skin, loss of hair and inability to concentrate.
Various authors have suggested that thyrotoxic myopathy is a result of the weight loss and generalized asthenia associated with hyperthyroidism. Muscle involvement has been reported to occur in about 80% of thyrotoxic patients (see section #Epidemiology ), [ 7 ] and the most common causes of hyperthyroidism are Graves’ disease , toxic ...
TED causes inflammation and damage to the tissues around the eye and usually occurs in people with Graves' disease, an immune system disorder that results in overproduction of thyroid hormones.
[3] [5] [10] Even moderate weight loss can lower T3. [2] This may be primarily via reduced levels of leptin (the satisfaction hormone). Low leptin levels can downregulate hypothalamic TRH neurons and cause a reduction in TSH. [5] [10] Ιn fasting animals, administering leptin reverses NTIS symptoms and restores thyroid hormone concentrations. [5]
About 70% of affected cats also have enlarged thyroid glands . 10% of cats exhibit "apathetic hyperthyroidism", which is characterized by anorexia and lethargy. [65] The same three treatments used with humans are also options in treating feline hyperthyroidism (surgery, radioiodine treatment, and anti-thyroid drugs).
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.
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