Hypopituitarism, a rare disorder, is when your pituitary gland doesn\u2019t produce enough of one or more hormones. It\u2019s caused by damage to the gland or the area around it, including from a pituitary tumour. The greater the damage, the greater the decrease in function, with the first to be affected normally being growth hormone, followed by the gonadotrophins (which affect sexual and reproductive function) followed by the hormones that control the thyroid and adrenal function.<\/p>\n