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Most cases of ED are caused by physical problems alone or in combination with emotional ones.
Just about any medical condition that affects your nerves or blood vessels could hurt your ability to have erections. High blood pressure, heart disease, multiple sclerosis, and diabetes can all lead to ED. In fact, over 50% of men with diabetes find themselves in that situation.
Hormonal issues such as low testosterone levels can also factor in, more often for older men. Prostate cancer treatments including surgery and radiation may be the culprit.