The cause of the obstacles caused sperm production

(1) genetic disease: autosomal or sex chromosome abnormality effects such as gram testicular sperm formation (Klinefelter) syndrome.

(2) congenital abnormal testicular: testicular growth unusual or abnormal testicular position all can make sperm production and obstacles.

(3) testicular itself lesions: such as testicular torsion and testicular inflammation traumatic vascular lesions.

(4) endocrine diseases pituitary function hyperthyroidism or pituitary tumor low adrenal function hyperthyroidism or a low hyperthyroidism or low all can affect sperm production and cause no sperm disease.

(5) serious systemic disease and malnutrition can cause no sperm disease.

(6) radiation damage and drug especially cell factors such as drug toxicity testicular sperm cells that life can cause serious damage when no sperm disease.