Some of the causes of the decline in sperm quality are congenital or acquired diseases, while others are caused by some bad factors in life. Shi Qixian said, there are eight kinds of factors have been proved in the study on the sperm quality does have an impact, men especially to avoid. 1, formaldehyde and other chemicals to reduce the number of sperm, low motility, producing deformities, the newly renovated house is best to measure the sperm cells are the most sensitive cells in the human body to changes in the external environment, the environment is slightly contaminated will affect the sperm, and is not easy to be detected by the human body. Domestic and foreign experiments have long been proved, such as formaldehyde (the city is mainly for the decoration pollution), xylene, organophosphorus pesticides, herbicides, cotton phenol and other chemicals, will destroy the protective barrier of the testicles and infringe on the sperm cells, so that the number of sperm reduced, low motility, malformation, and so on. 2, research has confirmed that 44 ° C is the critical point that affects the survival of sperm. If a man takes a bath in hot water above 44°C for half an hour, sperm vitality will be significantly reduced, temporarily losing fertility. 3, X-rays can lead to sperm deformities in the United States, Britain, Japan and other countries decades ago, the epididymis is very sensitive to radiation exposure. The spermatozoa stored in the testes will become deformed when exposed to X-rays. 4, estrogen affects sperm growth Estrogen will fight against androgens, and sperm growth depends on androgens. Excessive intake or application of exogenous estrogen leads to lower sperm quality. This conclusion was confirmed as early as the 1960s. Therefore, some health products in the estrogen content is high (such as royal jelly), this kind of health care products should not be eaten. 5, lack of vitamin A sperm to stay in the testicles can not be released! In 1987, British scientists through animal experiments found that males if the body lacks a certain amount of vitamin A, sperm will remain in the testicles, not released. Therefore, the man in moderation to supplement some vitamin A (animal liver in high content), the sperm have benefits. 6, alcoholism damage sperm Zhejiang Academy of Medical Sciences made in vitro sperm vitality research, the sperm in different alcohol concentrations in the culture fluid, found that when the alcohol concentration of more than 8%, sperm vitality decreased significantly, fertilization is impeded. Usually, the alcohol concentration of semen is less than 8%. Researchers estimate that adults drink a catty two two 50 degree white wine, sperm will be seriously damaged. 7, drugs indirectly affect the quality of sperm like marijuana, cocaine, heroin and other drugs will damage the brain’s hypothalamus, and the hypothalamus is androgen secretion management center. Therefore, drugs will indirectly lead to androgen decline, which in turn affects the quality of sperm. 8, prostatitis The prostate gland is very close to the testicles. If the prostate gland is inflamed, it will be “a fire in the city gates, and it will also affect the testicles, so that the quality of sperm decreases.