Non-obstructive azoospermia refers to no sperm in the semen because of abnormal sperm production.
Sperm production problems can result from hormonal problems, testicular failure, or varicocele, or varicose veins in the testicles.
Hormonal Causes of Non-Obstructive Azoospermia
Hormones are necessary for the testicles to produce sperm. The testicles produce sperm when they are stimulated by pituitary hormones. If there is an absence of these hormones, or a small amount of these hormones, sperm production can be affected. Men who take or have taken steroids may have affected the hormo
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