 [ Symptoms ] i started having severe pain in my lower back and left side abdomen just under my bottom rib should my doctor do other tests [ Disease ] hi in my opinion if all of these tests ct stool urine came back normal this can exclude any major problem so it can be gastroenteritis and or ibs so if you did not develop other symptoms like nausea vomiting blood proved in stool then stay assured it is nothing bad and get your medical treatment