Testicular heat
Physical factor
Evidence level : Established LifestyleMechanism : Environmental / physical burden
🟢 A link with fertility is documented by numerous, converging human studies, endorsed by health authorities.
- Where it's found
- Laptop on the thighs, frequent sauna and hot baths, heated seats, prolonged sitting, very tight underwear.
- Suspected mechanism
- Sperm production requires a temperature 2 to 4 °C below body temperature; repeated heating markedly reduces it.
- Suggested alternative
- Place the laptop on a table, stand up for a few minutes every hour, prefer loose-fitting underwear.
- Source
- Literature on scrotal hyperthermia and spermatogenesis.
Map your everyday exposures in about ten minutes.
Take the questionnaireRelated factors
Including a factor does not mean it causes infertility: it is simply worth monitoring, depending on its level of evidence.
Content last updated: September 14, 2026