There are more causes of impotence, mainly including the following: 1. neuropsychological factors, the most common cause; 2. co-morbid factors: such as combined hypertension, diabetes, etc. In the case of diabetes, for example, diabetes affects the autonomic nervous system, the mental nervous system affects erectile function, which leads to impotence; 3. vascular factors, such as atherosclerosis; 4. endocrine factors, as men age, the content of androgens in the body changes; 5. other: age factors, nerve conduction factors.