What are the causes of low sperm volume?
<answer> Caused by the use of cocaine or marijuana, Anabolic steroids, varicocele. <context> Low sperm count can be caused by a number of health issues and medical treatments. Varicocele. A varicocele (VAR-ih-koe-seel) is a swelling of the veins that drain the testicle. It's the most common reversible cause of male infertility.