a 27-year-old policewoman comes to your clinic, complaining of severe left-sided back pain radiating down into her groin. it began in the middle of the night and woke her up suddenly. it hurts in her bladder to urinate but she has no burning on the outside. she has had no frequency or urgency with urination but she has seen blood in her urine. she has had nausea with the pain but no vomiting or fever. she denies any other recent illness or injuries. her past medical history is unremarkable. she denies tobacco or drug use and drinks alcohol rarely. her mother has high blood pressure and her father is healthy. on examination she looks her stated age and is in obvious pain. she is lying on her left side trying to remain very still. her cardiac, pulmonary, and abdominal examinations are unremarkable. she has tenderness just inferior to the left costovertebral angle. her urine pregnancy test is negative and her urine analysis shows red blood cells. what type of urinary tract pain is she most likely to have?