What Causes Pain In Abdomen Radiating To Back?

I have pain at times in my right side and in my back on right side. I am wondering if it could be my kidneys. The

pain in my back starts under my s houlder blade and goes down a little in my back and the pain in right front

is under my ribs a little but sometimes goes around to my side. Trying to figure out what is causing this pain. Not

severe but know its there.