When common bacteria that cause UTI's travel from the urethra up to the kidneys, a kidney infection will develop (kidney infection is far more serious infection than UTI and its symptoms may get experienced within hours).
Severe pain that starts at the lower back spreading in front of the abdomen and to the groin, fever, nausea, vomiting, shivering, diarrhea are all symptoms of kidney infection.
Cloudy, smelly and bloody urine are additional symptom.
You may experience the UTI's symptoms, too, because of corresponding infections of bladder and urethra.
Having renal duplex collecting system means that the collecting system of urine coming out of a kidney is doubled.
Person with this structural variation, is more prone to obstructions (kidney stones) in urinary tract, urine reflux and infections.
Upper urinary tract infections or kidney infections and enlarged kidney due to dilated parts of kidney collecting system (hydronephrosis) are more common in people with doubled kidney collecting system.