What is the main cause of erectile dysfunction?

Obesity and metabolic syndrome may trigger changes in blood pressure, body structure, and cholesterol that may lead to ED. Other circumstances that may lead to erectile dysfunction include Parkinson's disease, sclerosis, Peyronie's illness, sleep disorders, alcoholism, and drug abuse. But what is the main cause of erectile dysfunction?
I have a friend who started doing drugs at the age of 16 and now he's suffering from ED and it's confirmed that it was the drugs he had been doing that gave rise to it.
 

John Herrera

New member
Obesity and metabolic syndrome may trigger changes in blood pressure, body structure, and cholesterol that may lead to ED. Other circumstances that may lead to erectile dysfunction include Parkinson's disease, sclerosis, Peyronie's illness, sleep disorders, alcoholism, and drug abuse. But what is the main cause of erectile dysfunction?
There is no pattern as to what may be the main cause for erectile dysfunction. All of these you already mentioned can be the main cause.
 
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