Risk factors

A variety of risk factors can contribute to erectile dysfunction. They include:
Getting older. As many as 80 percent of men 75 and older have erectile dysfunction. Many men begin to notice changes in sexual function as they get older. But erectile dysfunction isn't an inevitable consequence of normal aging. Erectile dysfunction often occurs in older men mainly because they're more likely to have underlying health conditions or take medications that interfere with erectile function.
Having a chronic health condition. Diseases of the lungs, liver, kidneys, heart, nerves, arteries or veins can lead to erectile dysfunction. So can endocrine system disorders, particularly diabetes.
Taking certain medications. A wide range of drugs — including antidepressants, antihistamines and medications to treat high blood pressure, pain and prostate cancer.
Certain surgeries or injuries. Damage to the nerves that control erections can cause erectile dysfunction.
Substance abuse. Chronic use of alcohol, marijuana or other drugs often causes erectile dysfunction and decreased sexual drive.
Stress, anxiety or depression. Other psychological conditions also contribute to some cases of erectile dysfunction.
Smoking. Smoking can cause erectile dysfunction because it restricts blood flow to veins and arteries.
Obesity. Men who are obese are much more likely to have erectile dysfunction than are men at a normal weight.
Metabolic syndrome. This syndrome is characterized by belly fat, unhealthy cholesterol and triglyceride levels, high blood pressure, and insulin resistance.
Prolonged bicycling. Over an extended period, pressure from a bicycle seat has been shown to compress nerves and blood flow to the penis, leading to temporary erectile dysfunction and penile numbness.