Some underlying diseases, psychological factors, hormonal disturbances, alcoholism and cigarette smoking increase the risk of erectile dysfunction.
According to the National Institutes of Health, erectile dysfunction is also a symptom in many disorders and diseases. Direct risk factors for erectile dysfunction may include the following-
Type 2 diabetes
Hypertension (high blood pressure)
Lack of sexual knowledge
Poor sexual techniques
Inadequate interpersonal relationships
High levels of blood cholesterol
Smoking, which accentuates the effects of other risk factors such as vascular disease or hypertension
Hypogonadism in association with a number of endocrinological conditions
Vascular disease and vascular surgery
Low levels of HDL (high-density lipoprotein)
Peyronie's Disease (distortion or curvature of the penis)
Priapism (painful and prolonged erection)
Many chronic diseases, especially renal failure and dialysis Age
appears to be a strong indirect risk factor in that it is associated with increased likelihood of direct risk factors, some of which are listed above. It is estimated that nearly 5% men become impotent by the age of 40-years, and 15-25% by the age of 65-years.