At your age...: At 28, the answer is almost never organic blood vessel disease, unless you have homozygous familial hyperlipoproteinemia. The *vast* majority of such cases are due to stress, lack of sleep, anxiety or other psychological issues. If none of that makes sense, it's reasonable to check a free testosterone level. If you have strong erections while asleep, it's psychological.
Answered 3/17/2017
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3 doctors weighed in across 2 answers
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