Cushing's syndrome is the result of excessive corticosteroids in the body. The main cause is overproduction of adrenocorticotropin hormone (ACTH) in the pituitary gland. ACTH causes the adrenal glands to produce corticosteroids, so too much of ACTH means too much of corticosteroids. Another main cause is taking long-term external steroids like prednisone (sometimes used in some chronic diseases). In addition, certain lung cancers and other tumors outside the pituitary gland may produce corticotropins. Other causes include benign or cancerous tumors on the adrenal glands. Rarely, Cushing syndrome can be an inherited endocrine disorder.
Ursodiol is a naturally-occurring bile acid that is made by the liver in humans and is secreted in small quantities into bile . It is used to dissolve and prevent cholesterol gallstones and to treat primary biliary cirrhosis , a disease of the liver. Ursodiol blocks the enzyme in the liver that produces cholesterol and thereby decreases production of cholesterol by the liver and the amount of cholesterol in bile. It also reduces the absorption of cholesterol from the intestine. By decreasing the concentration of cholesterol in bile, ursodiol prevents the formation and promotes the dissolution of cholesterol-containing gallstones. The mechanism by which it acts in primary biliary cirrhosis is not clear. The FDA approved ursodiol in December 1987.
Finally, tertiary prevention attempts to reduce the damage caused by symptomatic disease by focusing on mental, physical, and social rehabilitation. Unlike secondary prevention, which aims to prevent disability, the objective of tertiary prevention is to maximize the remaining capabilities and functions of an already disabled patient.  Goals of tertiary prevention include: preventing pain and damage, halting progression and complications from disease, and restoring the health and functions of the individuals affected by disease.  For syphilitic patients, rehabilitation includes measures to prevent complete disability from the disease, such as implementing work-place adjustments for the blind and paralyzed or providing counseling to restore normal daily functions to the greatest extent possible.