ANSWER: Cushing's disease comes about from an overproduction of cortisone and other adrenal gland hormones. The problem lies either in the pituitary gland, at the base of the brain, or in the adrenal glands. There is an adrenal gland on top of each kidney.
Regardless of the site, Cushing's disease can be cured. If there is a tumor in either the pituitary or the adrenal gland, as there usually is, it can be removed.
MaryO'Note: Hmmm. Cushing's can be cured. Is it usually? That's the question!