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.
Common Causes of ED. What causes erectile dysfunction? More than 90 percent of all ED can be traced to a physical (organic) cause. This cause is usually due to slow and steady decrease of blood flow to the penis, which eventually leads to inadequate and inefficient blood storage in the penis after it becomes erect. This is commonly referred as a venous leak.