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Hyperthyroidism is one of the most common endocrine conditions affecting older domesticated housecats. In the United States, up to 10% of cats over ten years old have hyperthyroidism. [63] The disease has become significantly more common since the first reports of feline hyperthyroidism in the 1970s.
Graves' disease data has shown that the lifetime risk for women is around 3% and 0.5% for men. [39] It occurs about 7.5 times more often in women than in men [1] and often starts between the ages of 40 and 60. [6] It is the most common cause of hyperthyroidism in the United States (about 50 to 80% of cases). [1] [4]
This latter occurs in 60 to 80 percent of patients with untreated hyperthyroidism. [10] Muscle weakness is rarely the chief complaint. The likelihood and degree of muscle weakness is correlated with the duration and severity of the hyperthyroid state, and becomes more likely after the age of 40.
Levothyroxine, a drug used to treat hypothyroidism, can lead to reduced bone mass and density in older adults with normal thyroid levels, a small cohort study has shown.
[11] [36] Hypothyroidism affects 3-10% percent of adults, with a higher incidence in women and the elderly. [37] [38] [39] An estimated one-third of the world's population currently lives in areas of low dietary iodine levels. In regions of severe iodine deficiency, the prevalence of goiter is as high as 80%. [40]
Endocrine disorders are often quite complex, involving a mixed picture of hyposecretion and hypersecretion because of the feedback mechanisms involved in the endocrine system. For example, most forms of hyperthyroidism are associated with an excess of thyroid hormone and a low level of thyroid stimulating hormone. [2]
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