Erectile dysfunction (ED or (male) impotence) is a
sexual dysfunction characterized by the inability to develop or maintain an
erection of the
penis. There are various underlying causes, such as
cardiovascular leakage and
diabetes, many of which are medically treatable.The causes of erectile dysfunction may be
physiological or
psychological. Physiologically, erection is a
hydraulic mechanism based upon
blood entering and being retained in the penis, and there are various ways in which this can be impeded, most of which are amenable to treatment. Psychological impotence is where erection or penetration fails due to
thoughts or
feelings (psychological reasons) rather than physical impossibility; this can often be helped. Notably in psychological impotence there is a very strong
placebo effect.
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