Less often, hypothyroidism develops when the pituitary gland fails and does not release enough thyroid-stimulating hormone (TSH), which stimulates the thyroid to produce and secrete normal amounts of T4 and T3.
In turn, the production of these hormones is controlled by thyroid-stimulating hormone (TSH) that is produced by the pituitary gland.
When production of the thyroid hormones increases despite the level of TSH being produced, hyperthyroidism occurs.
Thus Norman-French spelt its palatalized c-sound (= tsh) with ch as in cher and the English palatalized cild, &c. became child, &c. In Provençal from the 10th century, and in the northern dialects of France from the 13th century, this palatalized c (in different districts is and tsh) became a simple s.
In some foreign words like cicala the ch- (tsh) value is given to c. In the transliteration of foreign languages also it receives different values, having that of tsh in the transliteration of Sanskrit and of is in various Slavonic dialects.