SmI sperm motility index percent 53 is on the low side and may be related to poor lifestyle habits, reproductive system infections, congenital developmental abnormalities and so on. Under normal circumstances SmI sperm motility index is greater than 60%, when the SmI sperm motility index is 53%, it is a low situation, which may cause azoospermia, dead sperm, oligospermia, and pregnancy preparation failure. 1. Bad habits: Decreased sperm vitality index may be related to daily bad habits, such as staying up late, smoking, alcoholism, etc., or preferring spicy, greasy, cold food, which may lead to decreased sperm vitality. 2. Reproductive system infections: In addition, if there are testicular inflammation, epididymitis, prostatitis and other infections of the reproductive system, it may also affect the reproductive function, resulting in decreased sperm vitality. 3. Congenital developmental abnormalities: Congenital underdevelopment of testes, epididymis, seminal vesicles, vas deferens, prostate and other organs may also lead to decreased sperm vitality index. Decreased sperm vitality may also be caused by other factors, it is recommended that patients go to regular hospitals for relevant examinations in a timely manner, with the help of doctors to clarify the causes, and then carry out targeted treatment.