Anatomic:
Congenital deformities, Testicular fibrosis, Hydrocele.
Cardio Respiratory:
Angina pectoris, Myocardial infarction, Emphysema, Rheumatic fever, Coronary insufficiency, pulmonary insufficiency.
Drug Ingestion:
Addictive drugs, Alcohol, Alpha-methyl-dopa, Amphetamines, Atropine, Chlordiazepoxide, Chlorprothixene, Guanethidine, Imipramine, Methantheline bromide, Monoamine oxidase inhibitors, Phenothiazines,Reserpine, Thioridazine, Nicotine (rare), Digitalis (rare).
Endocrine:
Acromegaly, Addison's disease, Adrenal neoplasms (with or without Cushing's syndrome).
Castration:
Chromophobe adenoma, Craniopharyngioma, Diabetes mellitus, Eunuchoidism (including Klinefelter's syndrome), Feminizing interstitial-cell testicular tumors, Infantilism, Ingestion of female hormones (estrogen), Myxedema, Obesity, Thyrotoxicosis.
Genitourinary:
Perineal prostatectomy (frequently ), Prostatitis, Phimosis, Priapism, Suprapubic and transurethral prostatectomy (occasionally), Urethritis
Hematologic:
Hodgkin's disease, Leukemia, acute and chronic, Pernicious anemia
Infectious:
Genital tuberculosis, Gonorrhea, Mumps
Neurologic:
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.
Vascular:
Aneurysm, Arteritis, Sclerosis, Thrombotic obstruction of aortic bifurcation.
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