IMPOTENCE
Psychogenic.
Endocrine: hyperprolactinemia, DM, Cushing's syndrome, hypothyroidism or hyperthyroidism, abnormality of hypothalamic-pituitary-testicular axis.
Vascular: arterial insufficiency, venous leakage, AV malformation, local trauma.
Medications.
Neurogenic: autonomic or sensory neuropathy, spinal cord trauma or tumor, CVA, multiple sclerosis, temporal lobe epilepsy.
Systemic illness: renal failure, COPD, cirrhosis of liver, myotonic dystrophy.
Peyronie's disease.
Prostatectomy.