am Doctor Thomas, a double board certified doctor in internal medicine and integrative medicine, with advanced training in several other fields. I am a clinician of over 20 years experience. I will give you an initial answer or ask you a question, but be sure to use reply to expert to communicate with me as needed.
The common cause of endocrine impotence is diabetes.
A common cause of vascular is venous leak. This needs a urologist and ultrasound to diagnose. This is one of the first things we think of clinically.
Hypertension in general and high cholesterol.
Low testosterone levels from any cause.
These are the ones we see in the office, along with obesity [all too common], metabolic syndrome [common], parkinson's disease, heart disease [common] , tobacco use, sleep disorders [also common and missed]. Alcohol [common]. Medications [common].
I will mention that if you still get erections at all, it is likely not physical, but psychological.
See your urologist or internist at this point.
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I am a double board certified US doctor. I will always give you clinical, accurate, precise and comprehensive answers based on practicing clinical medicine for over 20 years.
Let me know if you have more questions.