I had a recent ct scan showing no damage to the pelvis or penile arteries. all i have is a small umbilical hernia. what is the likely cause of my ed? i'm 31 years old male, testosterone under/around 400. 5'9 160 pounds. cannot get full erection?

There are many reasons for ED including hormonal disruptions, poor diet, stress, medications, etc. These issues do not show up on a CT scan. I would follow up with a family doctor to thoroughly investigate the list of potential triggers.

ED can be caused by many things which need to be investigated by a Urologist sub specializing in ED. It is a good sign that these tests are normal .Once the cause is found and treated you will be fine. Good luck