Erectile dysfunction (ED), also known as impotence, is a type of sexual dysfunction(Disorder) characterized by the inability to develop or maintain an erection of the penis( Male Reproductive part) during sexual activity. Erectile dysfunction can be a sign of a Physical or Psychological condition. Occasional ED is not uncommon. Many men experience it during times of stress. If erectile dysfunction is an ongoing issue, however, it can cause stress, affect your self-confidence and contribute to relationship problems. Problems getting or keeping an erection can also be a sign of an underlying health condition that needs treatment and a risk factor for heart disease.Medical conditions, particularly diabetes or heart conditions.