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.
Symptoms of an overactive thyroid can include: nervousness, anxiety and irritability. hyperactivity â you may find it hard to stay still and feel full of nervous energy. mood swings. difficulty sleeping. feeling tired all the time. sensitivity to heat. muscle weakness.