Everyone is from the sperm, seriously studied biology students know that sperm in the human body warm, protected environment can survive 3 to 5 days time, but low vitality what happened who knows it? 1, long-term abstinence, adult men if long-term access to ejaculation, sperm in the body for a long time can not be liberated, there will be a high density, dead sperm more such a condition, if men must not be too long abstinence after adulthood, which is likely to lead to infertility. 2, genitourinary system infection, if the genitourinary system is inflammatory or viral infection, it will cause changes in sperm composition, citric acid, fructose reduction and elevated pH will affect sperm vitality. Varicocele, which is due to the obstruction of blood circulation in the testes and epididymis, causes the local temperature to rise, which leads to the accumulation of toxic substances, thus making the sperm vitality lower, this situation will also lead to infertility, if possible, surgical interventions can be carried out to intervene in this situation. 4, low sperm volume, is also an important reason for low sperm vitality, testicular spermatogenic epithelium is not fully mature or damaged and become very thin, the sperm produced will be low vitality capacity.