Erectile dysfunction is the difficulty or inability to achieve or maintain an erection of the penis that results in a satisfying sexual relationship. Also known as impotence, but now it has stopped using this term in the medical field. It affects many men and increases with age, but to consider an alteration is necessary to manifest persistently. The most frequent causes of erectile dysfunction can be both physical and psychological or a combination of both. They can be of vascular type: an index of men with high cholesterol, smoking, diabetic or who have been treated with radiotherapy. The neurological disorders ( Alzheimer's, for example) and hormonal (for the use of any medication ) are in lower proportion. There may also be a cause of affective: Patients with severe forms of depression tend to have erectile dysfunction. Treatments other than medication often include changes in lifestyle, such as quitting smoking and practicing regular exercise.