Back problems dont know what it is?

I have been having this pain in the left side of my back by where the ribs are for about 2 months and it hasn't gone away. It only happens when I run or jump I could lift weights (except for snatch because I have to jump I still do it but it hurts when I land on my feet) I first got it when we were doing powerjumps like if it was a layup in basketball after that exercise my back felt like it was cramping badly then it went away. The second time playing basketball I was goin for a block and when I landed my feet on the floor I got the cramp badly I had to lay down on the floor for like 10 minutes, but now I haven't gotten the cramp lately for about a month but everytime I jump or run. Hard it like pokes me on the spot please help?