I Have Stabbing Pain In My Left Side At About

I Have stabbing pain in my left side at about waist level. I thought it might be related to muscle strain, but it does not go away after being careful to rest muscles in that area. It comes and goes. I can feel it coming on, then a day later it seems full blown. It is exacerbated by deep breaths or sudden twisting or moving. The pain radiates around to my back. When the stabbing pain occurs, it may last up to a a slow count of 3 or 4 at its worst and is severe. I do not have any blood in my urine.