1) Excessive frequency of hot water baths: the testes need an environment where sperm production is 1°C-1.5°C lower than the normal body temperature of 37°C. Some data show that after 3 consecutive days of immersion in warm water at 43℃-44℃ for 20 minutes, the original sperm density of a person with normal sperm density can drop to less than 10 million/ml, and this can last for 3 weeks. Therefore too frequent and too long hot baths are inappropriate for infertile patients with low sperm count and low viability. Of course 1-2 times a week and not too long hot water baths do not matter. 2) Malnutrition and partiality: Sperm production requires raw materials, so sperm production function and nutrition level are closely related. This does not necessarily require eating turtle and eel. But it is still essential to eat more lean meat, eggs, fish and vegetables to secure the necessary supply of protein, vitamins and trace elements. People with a partial diet are often prone to certain nutritional deficiencies. 3) Mental depression and excessive fatigue: depression and fatigue can affect sexual function and sperm production function. 4) Too much cycling, motorcycling, tricycling and horseback riding: this often causes chronic strain and congestion to the prostate and other accessory glands, affecting their function and aggravating chronic inflammation, affecting fertility.