The way to think about the causes of erectile dysfunction comes back to the previous point of what you actually need in order to have a good, strong erection. And those it's threefold. First, you need a good, healthy, nervous system. Secondly, you need good arterial inflow, and third, you need some form of venous outflow to keep the blood within the penis. If there's a problem along any of those, you could have some form of erectile dysfunction. So things such as diabetes, hypertension, low testosterone levels, obesity, drug, alcohol use, poor exercise habits. These are ultimately the things that could disrupt that healthy balance between the nervous system, the arterial inflow and the venous outflow, and in doing so could lead to some form of erectile dysfunction.
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