Why does my anus hurt after i run? i was told by my doctor that it's not hemorrhoids. it reallyhurts when i go to the restroom & it's only after i run

Fissure?: It's possible this is a fissure that we can treat most often with a simple ointment. Hemorrhoids are possible as well, but if your doctor examined the area, then maybe that's precluded. Without an exam, it's difficult to tell you. I would recommend seeing a physician to have this evaluated further. Common things being common, you will be fine, but should still have it checked out.

Fissure: This is probably an anal fissure. You should see someone as they are treatable.