Causas orgánicas que se subdividen según el problema de base que lo originan:

a) Vascular diseases are the most common, they restrict blood flow to organs. The following conditions are associated with vascular diseases: high blood pressure, diabetes, high cholesterol, obesity.

b) Neurological causes refer to side effects of conditions related to the central nervous system and spinal.

c) Psychological causes are more common with young men and may be stress, depression and performance anxiety.

d) Endocrine causes refer to hormone production, mainly testosterone.