If the stone is in the renal pelvis, the pain is mainly in the lumbar region. In some patients, the stone slips into the ureter and causes severe colic, which can be radiated to the lower abdomen, vulva and inner thighs. Low back pain: Pain, swelling and discomfort in the lower back, often located in the spinal rib cage, lumbar region and abdomen, mostly paroxysmal, but can also be continuous. In some patients, the stone slips into the ureter and causes severe colic. Colic is a typical symptom of kidney stones, often occurring suddenly with a cutting pain in one side of the lower back. It may radiate to the lower abdomen, vulva and inner thighs. The duration varies. Painful urination: Urethral stones have painful urination, which persists and is further aggravated by the rough surface of the stones in the urethra, which moves in the urethra during urination and stimulates spasm of the smooth muscle of the urethra. When the stone is located in the bladder wall segment of the ureter or at the ureteral orifice, it may be accompanied by bladder irritation and radiating pain in the urethra and head of the penis. The pain is often accompanied by nausea and vomiting because the ureter and the intestine have a common innervation. When the upper urinary tract is obstructed, the pressure in the lumen of the ureter increases, causing nausea, vomiting, abdominal distension, constipation and other symptoms due to local dilation, spasm or ischemia of the wall of the ureter. Pain is mostly followed by hematuria, and the amount of hematuria is related to the degree of damage to the urinary tract mucosa by the stone. Some patients can be found draining stones.