ED is often the result of diseases or conditions that become more common with age or a side effect of the medications used to treat them. Other causes include prostate surgery, stress, relationship problems, and depression. With age tissues also become less elastic and nerve communication slows.
Cardiovascular disease is a common cause. Blocked arteries affect not only the coronary arteries but those throughout the body as well. Up to 30% of men who see their doctors for ED have underlying heart blockages.
Intriguing findings from the Massachusetts Male Aging Study suggest there may be a natural ebb and flow to ED — that is, for some men, trouble with erections may occur, last for a significant amount of time, and then partly or fully disappear without treatment.
For some men, simply losing weight may help. Others may need medications, and there are other options available as well. (Harvard Newsletter)