Sudden, severe pain in your side, back, lower abdomen, or groin
Pain that comes in waves and may change in intensity
Pain or burning when urinating
Blood in the urine
Frequent urge to urinate
Passing only small amounts of urine
Cloudy or foul-smelling urine
Nausea or vomiting
Fever or chills
Trouble finding a comfortable position because of pain
Pain that moves from the back toward the groin
Urine that looks pink, red, or brown
A history of kidney stones
A doctor’s exam, urine test, or imaging test such as a CT scan or ultrasound