How long does it usually take for a uti to become a kidney infection? if a uti is left untreated?

UTI: A UTI can be in your bladder or your kidneys and both are treated with antibiotics. Usually a bladder infection will cause you lower abdominal pain, burning and frequency of urination. A kidney infection is usually accompanied by pain over the kidney or kidneys and perhaps radiation into the lower abdomen. Drink lots of fluid and go to your doctor to get the appropriate antibiotics. Good Luck