Well-meaning academics even introduced spelling absurdities such as the âsâ in the word âisland,â a misguided Renaissance attempt to restore the etymology of the [unrelated] Latin word insula. 1  A discrete, meaningful unit of language which is approved by some authority.
What is an overactive thyroid? Hyperthyroidism happens when the thyroid becomes overactive and produces too much of its hormones. Hyperthyroidism affects women 10 times more often than men, and is most common in people aged 20-40.
Underactive thyroid gland (hypothyroidism) results from the thyroid gland being unable to make enough thyroxine, which causes many of the body's functions to slow down. Hypothyroidism may also occur if there is not enough thyroid gland left to make thyroxine - for example, after surgical removal or injury.