Small kidney stones (<5mm) pass in the urine without causing pain or any other symptom.
Bigger stones (>6mm) tend to obstruct the flow of urine and cause symptoms. When obstruction to the flow of urine occurs it causes agonizing pain in the lower back. The pain may extend into the groin area (described as ‘loin to groin’ radiation of pain).
Other symptoms which may develop include nausea, vomiting, blood in the urine (hematuria), restlessness and fever (in case infection is present).
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