Being unable to have or keep an erection adequate for sexual activity is the defining mark of erectile dysfunction. The problem may manifest itself in several ways. If the dysfunction:
- Is transient or appearing only occasionally, the problem is not likely to be serious; all men experience problems with erections at some time in their lives.
- Develops gradually and persistently, there is probably a physical cause; this is generally the case with chronic impotence.
- Develops abruptly but you still have early-morning erections and are able to have an erection while masturbating, the problem is likely to have a psychological component, perhaps with an underlying physical factor.
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