Causes of infertility in males:
o Azoospermia:
Absence of spermatozoa from the seminal fluid.
o Hypogonadism (such as from Alcoholism, or chronic renal failure)
o Immotile Sperm
o Sperm Transport Disorder (obstruction of the vas deferens or epididymus)
o Exposure to hazardous toxins, chemicals, or radiation
o Mumps or venereal diseases
o Testicular injury (sports or work injury)
o Cystic fibrosis
o Immune reaction against sperm (antisperm antibodies)
o Testicular failure
o Chronic medical illness:
Thyroid disease, diabetes, and hypertension
o Spinal cord injuries and paralysis
o Varicocele