If there are small stones in the kidney, the possible symptoms are: 1. low back pain, if the stone causes obstruction, it can cause significant low back pain, which is expressed as acute low back pain. 2. low back pain, if the stone is not combined with obstruction, not combined with hydronephrosis, then after activity or after holding urine, there may be low back pain, low back pain, but not acute low back pain symptoms. 3. transient abdominal pain. This is often seen when small stones in the kidney are discharged into the ureter, stimulating the ureter to produce spasms, thus producing symptoms of transient abdominal pain, which can be relieved after the stones are discharged from the ureter. 4. If a stone causes an acute increase in pressure in the renal pelvis or an infection in the renal pelvis, it may be accompanied by nausea and vomiting, mostly caused by spasm of the gastrointestinal tract.