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, also called impotence, is the inability to develop or sustain an erection satisfactory for sexual intercourse. Though prostate cancer is not a cause of erectile dysfunction, treatments for the disease can cause the problem. These include: 1  Surgery to remove the entire prostate gland.  Radiation therapy, whether by external beam or radioactive seed implants.