Accepted Answer

Hi,

Possible reasons for low sperm count include:
Varicocele. This is a swollen vein inside the scrotum that can affect sperm production. This common cause of male infertility can be repaired with minor surgery.
Damaged sperm ducts. Inherited conditions, infections, surgeries or injuries can damage the delicate duct system that carries sperm from the testicles into the penis.
Anti-sperm antibodies. Men who have anti-sperm antibodies have an immune system response that attacks their own sperm. Common in men who have had a vasectomy reversal, this condition can also be caused by other problems such as an injury or infection.


Read the following link for more information -
http://www.mayoclinic.com/health/low-sperm-count/DS01049/DSECTION=tests-and-diagnosis

Let me know if you need any other information.

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Expert:	Dr Bhumika
Pos. Feedback:	96.8 %
Accepts:	719
Answered:	10/8/2009

Doctor

6 years of experience as family physician, general practitioner; MD Chest Diseases; Allergy, Asthma