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What is the difference between Cushing's syndrome and Cushing's disease?
Any condition that causes the adrenal gland to produce excessive cortisol results in the disorder Cushing's syndrome. Cushing syndrome is characterized by facial and torso obesity, high blood pressure, stretch marks on the belly, weakness, osteoporosis, and facial hair growth in females.
Cushing's syndrome has many possible causes including tumors within the adrenal gland, adrenal gland stimulating hormone (ACTH) produced from cancer such as lung cancer, and ACTH excessively produced from a pituitary tumors within the brain. ACTH is normally produced by the pituitary gland (located in the center of the brain) to stimulate the adrenal glands' natural production of cortisol, especially in times of stress.
When a pituitary tumor secretes excessive ACTH, the disorder resulting from this specific form of Cushing's syndrome is referred to as Cushing's disease.
As an aside, it should be noted that doctors will sometimes describe certain patients with features identical to Cushing's syndrome as having 'Cushingoid' features. Typically, these features are occurring as side effects of cortisone-related medications, such as prednisone and prednisolone.