Lately for some reason I have had an uncomfortable sensation that comes and goes in my anus, it feels like about an inch inside. Sometimes it's a sharp discomfort like there's a grain of dry rice in there or something and sometimes it's a dull ache like there's a marble in there. It's generally localised on my left hand side. My bowel movements are normal and there's no other indication of a problem apart from the irritating feeling like there's something jammed up inside me. (which, by the way, is not a possibility. I am not that way inclined) Anyone have any ideas what it is? It's not a painful problem, more a persistant annoyance.