causes of erectile dysfunction :

Male sexual arousal is a complex process that involves the brain, hormones, emotions, nerves, muscles and blood vessels. Erectile dysfunction can result from a problem with any of these. Likewise, stress and mental health concerns can cause or worsen erectile dysfunction.

Sometimes a combination of physical and psychological issues causes erectile dysfunction. For instance, a minor physical condition that slows your sexual response might cause anxiety about maintaining an erection. The resulting anxiety can lead to or worsen erectile dysfunction.

In many cases, erectile dysfunction is caused by something physical. Common causes include:

Heart disease

Clogged blood vessels (atherosclerosis)

High cholesterol

High blood pressure

Diabetes

Obesity

Metabolic syndrome — a condition involving increased blood pressure, high insulin levels, body fat around the waist and high cholesterol

Parkinson's disease

Multiple sclerosis

Certain prescription medications

Tobacco use

Peyronie's disease — development of scar tissue inside the penis

Alcoholism and other forms of substance abuse

Sleep disorders

Treatments for prostate cancer or enlarged prostate

Surgeries or injuries that affect the pelvic area or spinal cord