Congenital deformities, Testicular fibrosis, Hydrocele.
Angina pectoris, Myocardial infarction, Emphysema, Rheumatic fever, Coronary insufficiency, pulmonary insufficiency.
Addictive drugs, Alcohol, Alpha-methyl-dopa, Amphetamines, Atropine, Chlordiazepoxide, Chlorprothixene, Guanethidine, Imipramine, Methantheline bromide, Monoamine oxidase inhibitors, Phenothiazines,Reserpine, Thioridazine, Nicotine (rare), Digitalis (rare).
Acromegaly, Addison's disease, Adrenal neoplasms (with or without Cushing's syndrome).
Chromophobe adenoma, Craniopharyngioma, Diabetes mellitus, Eunuchoidism (including Klinefelter's syndrome), Feminizing interstitial-cell testicular tumors, Infantilism, Ingestion of female hormones (estrogen), Myxedema, Obesity, Thyrotoxicosis.
Perineal prostatectomy (frequently ), Prostatitis, Phimosis, Priapism, Suprapubic and transurethral prostatectomy (occasionally), Urethritis
Hodgkin's disease, Leukemia, acute and chronic, Pernicious anemia
Genital tuberculosis, Gonorrhea, Mumps
Amyotrophic lateral sclerosis, Cord tumors or transaction, Electric shock therapy, Multiple sclerosis, Nutritional deficiencies, Parkinsonism, Peripheral neuropathies, Spina bifida, Sympathectomy, Tabes dorsalis, Temporal lobe lesions.
Aneurysm, Arteritis, Sclerosis, Thrombotic obstruction of aortic bifurcation.