Why Kidney Stones Should Be Treated (and the Main Options)

Not every kidney stone needs a procedure — plenty of small ones pass on their own with time and fluids. But "wait and see" isn't always safe, and assuming a stone will simply sort itself out can backfire. Here's why treating a kidney stone matters, and a plain-language tour of the main options.

Why not just wait for it to pass?

Because some stones won't pass, and a blocked kidney can be quietly damaging. Larger stones — generally those above about 6 mm — are much less likely to pass on their own, and a stone that lodges and blocks urine flow puts back-pressure on the kidney. If that obstruction continues for weeks, it can cause lasting loss of kidney function, sometimes without much pain to warn you. Add the risk of infection building up behind a blockage, and the case for evaluating a stone rather than ignoring it becomes clear.

What are the signs a stone needs urgent attention?

Some situations are emergencies, not wait-and-see. Fever or chills alongside stone pain can signal an infected, blocked kidney, which needs immediate care. So can an inability to urinate, severe pain you can't control, persistent vomiting, or stone symptoms when you have only one working kidney or are pregnant. If any of those apply, treat it as an emergency — call 911 or go to the nearest emergency room.

What are the main treatment options?

Treatment is matched to the stone's size, location, and composition. The main approaches are:

• Watchful waiting with fluids. For small stones likely to pass, the plan may simply be hydration, pain control, and sometimes a medication that relaxes the ureter to ease passage.
• Shockwave lithotripsy (ESWL). Focused sound waves break the stone from outside the body — no incision, and usually no stent. It's a guideline-endorsed option for many stones under about 2 cm.
• Ureteroscopy. A thin scope is passed up through the urinary tract to the stone, which is broken up with a laser and removed. It has a high single-session clearance rate and often involves a temporary stent.
• Percutaneous nephrolithotomy (PCNL). For large or complex stones, a small incision in the back gives direct access to the kidney. It's done under general anesthesia and reserved for stones the less invasive methods can't clear well.

Which one fits depends entirely on your stone. You can compare the options side by side, read more about how shockwave lithotripsy works, or see why a stent isn't always necessary.

Why bother treating a stone at all?

Treatment isn't only about comfort — though pain relief is a real benefit. Treating a stone clears the obstruction before it can harm the kidney, removes a potential site for infection, and ends the disruption that stone pain causes to work and daily life. And because forming one stone raises your odds of forming another, treatment is also the natural moment to start preventing the next one.

The bottom line

Kidney stones range from "drink water and wait" to "treat promptly," and telling the difference takes an evaluation rather than a guess. If you know or suspect you have a stone — especially with significant pain or any warning signs — getting it assessed protects your kidney and gets you out of pain sooner. From there, the right treatment is the one matched to your specific stone.

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