I've had this for ages. It's not a pain, more a tightness/pulling across my lower abdomen, in the same place you'd feel period cramps. It's not all the time, just every now and then. If I stand up too quickly, I sometimes pull a muscle there and have to bend over for a few seconds til it passes. The same if I'm laying down and I cough.
I'm not explaining it well - does anyone know what I mean?? Could it just be weakness after having had 2 kids (youngest is 7) - or something to do with when I'm ovulating (although it's in the middle of my abdomen, not to either side)?