The causes of testicular cold can be categorized into physiological and pathological causes, such as meeting physiological functions, low temperature of the external environment, testicular arteriovenous torsion, prostatitis and so on. 1. Physiological reasons: (1) to meet the physiological function: testicles in the scrotum, located outside the abdominal cavity, its temperature is slightly lower than the body temperature, slightly lower temperature is conducive to spermatogenesis, so testicular cold is a normal physiological phenomenon. (2) The temperature of external environment is too low: when the temperature of external environment is too low, the temperature of testicle itself is slightly lower than the body temperature, and the temperature in this environment seems to be even lower, so the phenomenon of cool testicle appears. 2. Pathological causes: (1) Testicular arteriovenous torsion: when the testicular arteriovenous torsion occurs, it leads to the obstruction of blood transportation in the testicles and ischemia of the testicles, resulting in the problem of testicular coldness, which can be accompanied by the symptom of severe pain in the testicles at this time. (2) Prostatitis: When prostatitis occurs in men, blood circulation in the perineum may be obstructed, which leads to poor blood supply to the testicles, resulting in the symptom of cold testicles. There are many other causes of cold testicles, and such patients are advised to go to regular hospitals and consult professional doctors to avoid blind treatment.