I've had this problem for a while, where my stomach will start to hurt (random times a day) and will continue to hurt for hours on end. I'm not hungry when this happens, I'm not constipated and don't need to number two at all. It happens even when I am not on my period, and when it starts up when i do have my period, it feels ten times worse. I don't know if this could be something serious, i just need to be sure.