II. CAUSES OF ERECTILE DYSFUNCTION
C. Other Causes
Endocrine causes represent less than 5% of patients and yet many patients are referred to endocrinologists. The majority of men who have ED have been found to have normal testosterone levels. Thyroid, pituitary, and adrenal diseases may cause ED, albeit rarely. A urologist’s opinion is rarely required and yet most patients first seek the advice of a urologic specialist. Prostate surgery may cause some degree of ED in greater than 50% of patients.