Multiple kidney stones in both kidneys can cause severe side pain, back pain, burning urination, nausea, vomiting, or blood in urine, especially when the stones start moving or block urine flow. Stones around 5 to 9 mm may sometimes pass naturally, but larger or multiple stones can become more difficult to pass and may continue causing pain and irritation. Pain-relieving medicines, adequate hydration, and medicines that help relax the urinary passage are commonly used to improve comfort and support stone passage in selected cases. Reducing salt intake and drinking enough water may also help reduce further stone formation. Since there are multiple stones in both kidneys, regular monitoring with scans and urine tests becomes important to check whether any stone is causing blockage or kidney swelling. Very severe pain, fever, vomiting, reduced urine output, or difficulty passing urine can mean the stone is obstructing urine flow or causing infection and may need faster urology treatment. Some stones may eventually require procedures such as lithotripsy or endoscopic removal if they do not pass or continue to cause recurrent symptoms.