My husband has pain in lower left back, relieved a little with heat, heat patch, light massage. The area seems slightly swollen. The pain is in the lower left flank... insists that it is not kidney. He states that there are no other symptoms, he is enamored of those stupid blue pucks to keep the toilet clean so color or cloudy urine is impossible to detect. His chiropractor told him its musculoskeletal. The pain he has is sometimes stabbing [with movement] but a constant dull or throbbing, seems to have a hard time moving at times. Any ideas if it is something other than kidney?