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.
The common symptoms of an overactive thyroid are weight loss, increased appetite, irritability, rapid heart rate and anxiety, according to the Office on Women's Health, whereas underactive thyroid symptoms include weight gain, cold sensitivity, fatigue, depression and muscle weakness.