The causes of slow erection usually include vascular factors, endocrine factors and neurological factors, etc., which require prompt medical treatment once discovered. 1. Vascular factors are the main causes of slow erection, such as arterial injury, arterial stenosis, atherosclerosis and cardiac function abnormalities, etc. All of the above diseases can cause a reduction in arterial blood flow to the cavernous body of the penis, which in turn leads to slow erection. 2. Endocrine factors, such as thyroid disease and hypogonadism, can also lead to a decrease in blood testosterone levels, which in turn leads to slow erections. 3. Neurological factors usually include damage to central and peripheral nerves, such as strokes, spinal cord lesions and other diseases, which can lead to nerve conduction disorders, resulting in slow erections. If you have a slow erection, you need to actively seek medical advice and follow the doctor’s instructions for reasonable treatment.