Low sperm PR refers to low sperm vitality, which may be caused by bad living habits, inflammation of the reproductive system, varicocele and so on. 1. Bad life habits: long-term staying up late, drinking alcohol, high-temperature work, environmental pollution, etc. will affect the quality of sperm and lead to low sperm vitality. 2. Inflammation of the reproductive system: Inflammation of the reproductive system, such as prostatitis, seminal vesiculitis, epididymitis and so on, these inflammations will change the pH of semen, in addition, inflammation will cause an increase in the number of leukocytes in the semen, which will lead to low sperm vitality. 3. Varicocele: Varicocele is a vascular lesion, which is mainly due to the abnormal expansion, elongation and tortuosity of the spermatic vein plexus. Varicocele can lead to a lack of nutrient supply resulting in a decrease in the quality of spermatozoa due to the stagnation of blood in the varicose veins and the obstruction of microcirculation, in addition to the fact that varicocele can lead to autoimmunity, which can indirectly lead to a decrease in the vitality of the spermatozoa. Low sperm vitality will affect the male fertility, it is recommended to go to the hospital for examination and treatment.