My wife had a kidney infection about 6 weeks ago. She is very active and teaches fitness classes several days a week. For the last couple of weeks she has been complaining of swelling and tenderness in her feet. She now has soreness in her legs and has swelling in her hands as well. This soreness doesn't seem to be related to her classes. I suspect her kidney infection never completely cleared up. What should I be on the look out for regarding her condition?