Causes of a low sperm count

In many cases, it's not obvious what causes a low sperm count.

Sometimes problems with sperm count and quality are associated with:

  • ahormone imbalance, such as hypogonadism (reduced hormone production)
  • a genetic problem such as XXY (Klinefelter syndrome)
  • having had undescended testicles as a baby
  • astructural problem for example, the tubes that carry sperm being damaged and blocked by illness or injury, or being absent from birth
  • a genital infection such as chlamydia , gonorrhoea or prostatitis (infection of the prostate gland)
  • varicoceles (enlarged veins in the testicles)
  • previous surgery tothe testicles or hernia repairs
  • the testicles becoming overheated
  • excessive alcohol consumption, smoking and using drugs such as marijuana or cocaine
  • certain medications, including testosterone replacement therapy, long-term anabolic steroid use , cancer medications (chemotherapy), some antibiotics and some antidepressants
Content supplied by the NHS Website

Medically Reviewed by a doctor on 21 Dec 2018