Chapter 3
Causes
Several factors can raise the risk of low sperm count, and this chapter works through them, while noting that many men never receive a clear explanation. It covers conditions that raise testicular temperature, such as undescended testicles and varicocele, and infections including epididymitis, orchitis and STIs. Genetic causes such as Klinefelter syndrome are explained, along with how the hormones GnRH, FSH and LH work together to drive sperm production and what happens when that balance is disrupted. Tumours and their treatments, environmental toxins, and habits like smoking, alcohol and drug use are also discussed.