Why does my back hurt?

Why does my left lower back hurt?

• my lower left back hurts(almost my side) it started hurting last week but it didnt hurt that much before, now it hurts so much ( cant even walk right),, this is after i played basketball. i dnt know the cause of it but i think its because of Air Alert 3 free edition(a vertical jump program)+ i had weight room for gym class, or cuz of cold + basketball, or was jst my sleeping position. why does it hurt so much and what do u think was the cause? should i stop air alert3? i try to stretch sometimes but it really hurt so much( and i dnt know some stretch for it i jst try to bend back and all that)

• Answer:

  could be a kidney stone Try drinking lots of water and cranberry juice - but be prepared, when it comes out, its going to rip its way out.