Some patients with urinary stones have no clinical symptoms at all, and are often found incidentally during routine physical examinations or during ultrasound or abdominal X-ray examinations for other disorders. In some patients, although the stones are large and even fill the entire renal calyces, they do not cause secondary lesions such as obstruction or infection and have no clinical symptoms. In some patients, the obstruction occurs slowly and remains asymptomatic until hydronephrosis, severe impairment of renal function, or even complete loss of function. Most patients with urinary stones have clinical symptoms such as renal colic, but they usually have intermittent episodes and can be completely asymptomatic between episodes. The disappearance of symptoms does not mean that the stone has been expelled and the disease has been cured. Therefore, once urinary stones are found, you should visit a urologist with or without symptoms, and listen to the advice of a urologist to avoid delaying the disease.