Kidney stones do not carry a pain ranking, and painful kidney stones are less common, but mainly painful ureteral stones are more common, and the pain can be more intense. Ureteral stones are narrow and when they are embedded in the ureter causing spasm and pressure increase, there will be severe pain with paroxysmal intensification, similar to a knife cut. According to the WHO pain scale, 0 degree is no pain; 1 degree is mild pain, without medication; 2 degree is moderate pain, continuous pain, which will affect rest and requires painkillers; 3 degree is severe pain, continuous pain, which cannot be relieved without medication; 4 degree is severe pain, continuous severe pain accompanied by changes in blood pressure, pulse and so on. However, because each person’s pain perception is different, it is graded according to the times. Ureteral stones can reach degree 3 or degree 4 in serious cases and need to be dealt with in time.