Common symptoms of urinary stones include localized pain, hematuria after activity, and secondary urinary tract infection. In addition, depending on the location of the stone, the symptoms may vary: kidney stones may be asymptomatic, but may also cause back pain due to local obstruction; ureteral stones may be mildly painful or uncomfortable in the lower back, or may be severe with sudden and severe cutting pain; bladder stones may have a sudden interruption of urination; stones may have difficulty urinating and stinging pain in the urethra, and even hard stones may be felt in the anterior urethra.