The symptoms of kidney stones are as follows: Most patients with kidney stones will experience back pain or abdominal pain, or if the kidney stones develop quickly and are large, they may also cause sudden colic and severe pain. Patients usually also experience blood in the urine, and the severity of hematuria is related to the degree of damage. Patients with stones may have a more concentrated urine. It is best to treat patients with stone disease in a timely manner because if left untreated, when it grows, it can only be treated through surgery, which is painful and dangerous.