I get an itchy bum on and off in the evening. I understand about the symptoms of worms and I've not seen anything in my stools, nor have either of my young DC (one in nappies) had any symptoms, so have assumed it can't be worms. Also it's on and off - one night, then nothing for a while, then a few nights then nothing again. I assume worms would plague you until you treated them. I do have a recurring pile which can be itchy but weird it's in the evening only. Any ideas?