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.
Erectile Dysfunction Physical and Psychological Causes. While most people think that ED stems from penile dysfunction, it is far from true. There are other numerous physical and psychological causes of erectile dysfunction which is precisely the reason why the problem is complex in nature. A minor physical condition can slow sexual stimulation, resulting in unusual difficulty in maintaining an erection. Gradually, this can even worsen the condition.