question: I have the flu and notice some stabbing pains near left kidney . I have type a flu, slight fever..taking tylenol, dry cough..other typical aches n pains. The stabbing pain comes cpl times every two or three hours..it is not excruciating but the few secs it lasts I def feel it. Could this be related to flu? Never had it before but have had lower back pain upon standing. I m female..50 in good health..5 5 110 lbs