Sperm viability decreases from 80% to 53%. The causes of this condition may be infectious factors, immunologic factors, environmental factors and lifestyle. 1. Infectious factors: If the male reproductive organs, such as the prostate, epididymis and vas deferens, are infected, it may affect the viability and motility of sperm. 2. Immune factors: If the body is affected by various factors and produces anti-sperm antibodies, the anti-sperm antibodies will attack the sperms, which in turn will hinder the movement of the sperms, resulting in reduced sperm motility. 3. Environmental factors: If you are exposed to high temperatures, high levels of radiation or chemical toxins for a long period of time, it will reduce the vitality of your sperm. 4. Lifestyle: For example, smoking, alcoholism, staying up all night and other bad lifestyle, will affect the sperm vitality. In addition, the sperm vitality itself may fluctuate to a certain extent, but as long as it is within the normal range, there is no need to worry about it. Sperm vitality is one of the most important factors affecting male fertility. In your daily life, you should ensure a good state of mind, regular work and rest, and quit smoking and drinking to help improve your sperm vitality. If sperm motility continues to drop, you should seek medical treatment to avoid affecting the normal male reproductive function.