Causes of male impotence: 1. Heavy metal poisoning has a great impact on human health and can also lead to male impotence. Among them, lead, mercury and cadmium have the greatest influence. When the human body ingests too much lead, it will seep into semen or eggs and be stored, which will affect the secretion of reproductive hormones, leading to the decrease of sperm number, deformity and pregnancy. Mercury can affect men's sexual desire, resulting in decreased sexual desire, inability to erect, and even male infertility in severe cases. Cadmium can affect the secretion of sex hormones, which is harmful to the liver and kidneys. 2. Sitting on a soft sofa for a long time, a man's normal sitting posture should be based on the pelvis and the scrotum stays between his legs. This sitting posture has no effect on male scrotum. However, if a man sits on a soft sofa for a long time, because the sofa is too soft, the man's fulcrum will sink, his legs will be caught unconsciously, and his scrotum will be oppressed, which will hinder the flow of blood. For a long time, the damage to male scrotum is very serious. 3. Exercise bike takes too long. Many men have the habit of fitness, and fitness bike is a favorite exercise method for many people. However, it is suggested that men should not step on it for too long, because under normal circumstances, the cushion of bicycles is generally hard and the front is prominent, so men sitting on it will often touch the scrotum. The longer you ride, the more times you touch your scrotum. Long-term collision will lead to nerve damage, scrotum softening, seminal vesicle and testicular reticulation swelling, more serious will affect blood circulation, and ultimately affect male erectile function. It is very common sense that smoking is harmful to health. But if men know that smoking leads to impotence, will men who keep their hands on them continue to smoke? Harmful substances in cigarettes can cause arteriosclerosis and hinder blood circulation, which may lead to the situation that it cannot be lifted. In addition, smoking will cause the penis of men to straighten and bend, which will affect normal sexual life.