Many causes: Causes include stress, metabolic conditions such as hypertension, diabetes, hormonal imbalance ssuch ashypogonadism (low testosterone), and hi cholesterol. If no physiological source is found, then psychological factors need to be investigated such as depression.
Answered 10/3/2016
6.1k views
Depends: Low testosterone, performance anxiety, many medications, diabetes etc can be the factors.
Answered 9/13/2013
6k views
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