I have same thing. For years. I believe, this is hemorrhoid, which happens to be internal and near other organs.
thanks for replies i dont think it is prostate as no other symptoms associated with prostate problems. i stand most of the day my job is not strenuous it hurts while standing and aches while sitting i have had this for six months. i have been diagnosed with a small internal hemmeroid which did pop out and then dissapeared. i dont think hemmeroids ache. i also think the area where there is pain is called perineal
Do you have a Desk job or perform strenuous activities? It could be the way you sit. When does it hurt? lying? sitting?
have you ruled out hemmroids that are internal?