A kidney stone can form when substances such as calcium, oxalate, cystine, or uric acid are at high levels in the urine. Stones can also form if these substances are at normal levels, especially if the amount of urine made each day is low. The substances form crystals, which become anchored in the kidney and gradually increase in size, forming a kidney stone. You may pass "gravel" or "sand," which are small stones in your urine.
Typically, the stone will move through the urinary tract and is passed out of the body in the urine. A stone may cause pain if it becomes stuck and blocks the flow of urine. Large stones do not always pass on their own and sometimes require a minimally invasive surgical procedure to remove them.
Related Herbs: Common Club Moss & Horsetail
