Hi I've been having pain that comes and goes around that is in the area that my kidneys are but i dont know if its just a pulled muscle or if I actually have a kidney problem or a uti. My urine has a few bubbles and i think a bit of foam but it always comes and goes. Also I dont have any fever or Im not sick or anything and it doesnt hurt when I urinate besides sometimes I get a tiny burning feeling minutes after. But im still paranoid because I went for an abdominal ultrasound a few weeks ago and nothing was wrong with my kidneys and had no infection so could it just be a muscullar issue?