With the in-depth study of penile erectile dysfunction (ED for short), it has been found that at least 50 diseases can cause a series of symptoms in men with erectile dysfunction as the main manifestation. In particular, certain common and serious health risks, such as atherosclerosis, hypertension, diabetes, certain neurological pathologies, etc., can be combined with or alone in these disease processes, especially in the early stages of the pathology. In recent years, more and more medical professionals have realized that the observation of penile erectile function can predict the occurrence of arteriosclerosis, embolism, and many systemic neurological pathologies earlier than other symptoms, so that coronary heart disease, cerebrovascular accidents, multiple sclerosis and other serious pathologies that may threaten the lives of patients can be diagnosed, treated, and prevented early. In this sense, the erectile function of the penis is like a mirror that reflects a lot of information about the health of men. It is no wonder that some scholars have come up with the image that “the penis is the heart exposed outside the body. Why is the erectile function of the penis such a concern among the many physiological phenomena in men? To answer this question, we have to give a brief introduction to the physiological knowledge of erection: the essence of the phenomenon of penile erection is a “neurovascular” phenomenon. In layman’s terms, it is the induction of stimulation that causes the nervous system to undergo a series of “reactions”, and under the “command” of the nerves, the penile arteries expand, the blood supply increases, and the smooth muscle of the cavernous body expands, making the erection hard. It is easy to see how high the vascular function “requirements” are when an erection occurs, citing a set of data. When the penis is atrophied, the perfusion of blood vessels in the cavernous body of the penis is 1 to 4 ml/min, which is only enough for the nutrition of the smooth muscle tissue structure of the cavernous body of the penis, while when an erection needs to be completed, the blood flow can reach 80 to 120 ml/min in a short period of time, which is 25 times the average blood flow when the penis is atrophied. Looking again at hypertension, coronary heart disease, diabetes, etc., early manifestations can be manifested as damage to small blood vessels (poor dilatation, sclerosis, obstruction) in the periphery of the body, heart, brain, etc. As a functional organ exposed to the body surface, the penis is vascularized by small and medium-sized peripheral blood vessels, and any pathological factor that damages small and medium-sized blood vessels can be manifested through the phenomenon of penile erectile dysfunction. The 25-fold difference in blood perfusion between the functional and non-functional states also makes a relatively small impairment apparent when magnified 25 times. Therefore, penile erectile function can be used as a sensitive indicator to observe small and medium-sized vascular function. If a patient does not remember to seek medical attention and treatment until after brain, heart or kidney damage has occurred, it is clear that the best time for treatment has been missed and may cause great damage to health. A follow-up review of people with cardiovascular disease found that a large proportion of the population had early ED. The penile erection phenomenon is the most easily observed, but also the most easily ignored. This is a reminder to the majority of male friends: do not ignore the phenomenon of erectile dysfunction, it may allow your health risks exposed to the doctor as soon as possible, in order to avoid causing you greater misfortune.