What Causes Pain Abdomen Radiating To Groin?

I have symptoms similar to sciatica, (right side), however, there has been pain in my right leg joint, (inner), and some in lower right abdomen, even radiating toward groin. The pain seems to move to different places, in a strange way. Lower right back is stiff and painful, mild, dull radiating pain in lower right abdomen, worst pain has been in right leg joint, but that particular pain is not as frequent.