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.
Arteriosclerosis also causes erectile dysfunction in over 50 percent of men who are over the age of 60. There are over 200 prescription medications that can contribute to erectile dysfunction. This would include medications for high blood pressure, tranquilizers, antidepressants and sedatives. Alcohol and drug abuse alter the nervous system and the vascular system, causing impotence.