Many people with medullary sponge kidney have no symptoms. The first sign that a person has medullary sponge kidney is usually a UTI or a kidney stone. UTIs and kidney stones share many of the same signs and symptoms:
burning or painful urination
pain in the back, lower abdomen, or groin
cloudy, dark, or bloody urine
foul-smelling urine
fever and chills
vomiting
People who experience these symptoms should see or call a health care provider as soon as possible.