help?

It's nowhere near my period right now, but I often get these pains in my upper left stomach and lower right. I don't think they're cramps, I don't know I've never really had them... I don't know what they are, but they're sharp and cause upper and middle back pain as well. What do you think it is? They occur often, not just around a cycle day or time or whatever. It's all the time for about 20 minutes and then it's like it never happened.