Sudden, severe pain in the side, back, or lower abdomen
Pain that comes in waves and may move toward the groin
Painful urination
Blood in the urine
Cloudy or foul-smelling urine
Frequent urge to urinate
Urinating small amounts
Nausea or vomiting
Restlessness or inability to get comfortable
Fever or chills
Difficulty passing urine
History of kidney stones
Diagnosis confirmed by a doctor with urine tests, imaging, or both