How Long Does It Take to Pass Kidney Stones After Extracorporeal Shock Wave Lithotripsy

Extracorporeal shock wave lithotripsy (ESWL) is a common and non-invasive procedure used to treat kidney stones. After the procedure, the time it takes for the body to expel the stone fragments largely depends on the size and hardness of the original stone. In most cases, patients can begin to pass stone fragments within 24 hours, and softer stones may even be expelled on the same day.

Following the procedure, although the stone is typically broken into smaller pieces, these fragments still remain as solid particles. To help flush them out of the urinary system, it is essential to drink plenty of water—ideally between 2,000 to 3,000 milliliters per day. Staying well-hydrated increases urine production and helps move the stone fragments out more efficiently. Light physical activity, such as walking, is also recommended to encourage the movement of the stones through the urinary tract.

Most patients will begin to pass small fragments within a day after treatment, with the majority being expelled within a few days. However, larger or harder stones may not be fully fragmented during the first session. In such cases, a second treatment may be scheduled about a week later to further break down the remaining pieces, allowing for easier and more complete expulsion.

During the elimination process, some individuals may experience mild abdominal discomfort or notice blood in their urine. This is generally considered normal and should subside as the stone fragments are passed. Increasing fluid intake can help alleviate these symptoms and support a smoother recovery.

In summary, while most patients start passing stone fragments within a day after ESWL, complete clearance may take a few days. For optimal results, staying hydrated and following post-treatment care instructions is crucial.