In the past, doctors believed ED was caused by psychological problems such as depression and performance anxiety, but now as much as 90% of erectile dysfunction is believed to include some physical cause.
Here's a list of ED risk factors and causes that should be considered.
High blood pressure (hypertension)
Atherosclerosis (hardening of the arteries)
Neurological disease (i.e. nerve damage and neuropathy)
Physical injury (especially pelvic trauma)
Stress or anxiety
Conflict with your partner