horse chestnut. n. 1. Any of several trees of the genus Aesculus, especially the European species A. hippocastanum, having opposite, palmately compound leaves, erect clusters of white flowers tinged with red or yellow, and spiny or smooth capsules containing large shiny brown seeds.
Painful erections are very uncommon unless you have recently experienced penile trauma or irritation. Other causes of erectile pain would include: 1  Peyronie's disease. 2  Penile mass. 3  Priapism. 4  Phimosis. 5  Penile Injury.
Psychological factors are responsible for about 10%-20% of all cases of erectile dysfunction, or ED. It is often a secondary reaction to an underlying physical cause. In some cases, the psychological effects of ED may stem from childhood abuse or sexual trauma. However, the most common psychological causes of ED include: