Do Kidney Stones Go Away? The Facts

Most kidney stones do pass on their own, but “going away” means something specific. A stone that leaves your body is gone. A stone that stays put can keep growing. And having one stone raises your risk of forming another. So the honest answer has two parts: yes, many stones pass without surgery, and no, the tendency to form them usually does not disappear.

Kidney stones are hard deposits made of minerals and salts that form inside the kidneys. They affect roughly 1 in 11 people in the United States at some point in life, according to widely cited national survey data. Knowing which type of stone you have, how big it is, and where it sits in your urinary tract tells you a lot about what happens next.

Do Kidney Stones Go Away on Their Own?

Yes. Small stones often pass through the urinary tract without any procedure. The ureter, the tube that carries urine from each kidney to the bladder, is narrow. Most stones that are small enough to travel that tube will eventually move down and out with urine.

Size is the single biggest factor. Stones under about 5 millimeters pass on their own in the large majority of cases. Stones between 5 and 10 millimeters are less predictable. Stones larger than 10 millimeters usually do not pass without help, and some clinicians consider anything above 6 millimeters a candidate for intervention depending on symptoms.

Location matters too. A stone already in the lower ureter near the bladder has a shorter trip than one sitting high in the kidney. Shape counts as well. Smooth stones travel more easily than jagged ones.

Passing a stone can take days to several weeks. Some people feel almost nothing. Others have severe pain that comes in waves as the stone moves and the ureter contracts around it.

What Does Passing a Kidney Stone Feel Like?

The classic symptom is severe pain that starts in the back or side, below the ribs, and moves downward as the stone travels. Many people describe it as the worst pain they have felt. The pain often comes in waves rather than staying steady.

Other common signs include:

• Blood in the urine, which may look pink, red, or brown
• Pain or burning when urinating
• An urgent or frequent need to urinate
• Nausea and vomiting
• Cloudy or foul-smelling urine, which can signal infection

Pain that suddenly stops can mean the stone has moved into the bladder or has been passed. It does not always mean the problem is over.

Some stones cause no symptoms at all and are found on imaging done for another reason. These are sometimes called silent stones. They still deserve a conversation with a clinician, because a stone that is not moving can quietly grow.

When Is a Kidney Stone a Medical Emergency?

Most stones are painful but not dangerous. A few situations are different and need urgent care, not watchful waiting.

Get medical help right away if you have:

• Fever, chills, or feeling generally unwell along with stone symptoms
• Severe pain that does not improve
• Vomiting that prevents you from keeping fluids down
• Very little or no urine output
• Confusion or extreme weakness

Fever with a blocked urinary tract can signal an infection behind the blockage. That combination is a genuine emergency and needs immediate treatment. A stone that completely blocks urine flow from a kidney can also cause kidney damage if it is not addressed.

How Long Does It Take to Pass a Kidney Stone?

There is no fixed timeline. Some stones pass within days. Others take several weeks. A stone that has not moved after a reasonable period, or one that is causing ongoing pain, blockage, or infection, usually prompts a discussion about treatment.

During that waiting period, clinicians often recommend drinking plenty of fluids and may prescribe medication to relax the ureter and help the stone move. Pain control is a central part of care. Some clinicians recommend straining urine to catch the stone so it can be analyzed. That analysis matters more than most people realize, because the stone’s composition guides prevention.

What Happens If a Stone Does Not Pass?

When a stone is too large, stuck, or causing complications, treatment is needed. The options depend on stone size, location, and the person’s health.

Shock wave lithotripsy uses sound waves to break the stone into smaller pieces that can pass in urine. It is noninvasive but may require more than one session and does not always clear the stone completely.

Ureteroscopy uses a thin scope passed through the urinary tract to see and remove or break up the stone. It is common for stones in the ureter or kidney.

Percutaneous nephrolithotomy is a surgical procedure for large stones. It involves a small incision in the back to reach and remove the stone directly.

Each option has tradeoffs in recovery time, effectiveness, and risk. The right choice depends on the individual case, and a urologist is the person to weigh them.

Why Do Kidney Stones Keep Coming Back?

This is the part people underestimate. Passing a stone does not mean you are done with stones. Without changes, many people form another one. Recurrence is common, and some estimates put the risk of a repeat stone within several years at roughly half of people who have had one.

The most common type is calcium oxalate, followed by calcium phosphate, uric acid, struvite, and cystine stones. Each forms for different reasons. That is why stone analysis and sometimes a 24-hour urine collection are useful. They tell you what is actually driving your stones instead of guessing.

Several factors raise the risk of forming stones:

• Not drinking enough fluids, which makes urine concentrated
• A diet high in sodium and, for some people, high in animal protein
• Low dietary calcium, which sounds backward but can increase oxalate absorption
• Obesity and certain metabolic conditions
• A family history of stones
• Some medications and medical conditions, including recurrent urinary tract infections

One point worth correcting: cutting calcium from your diet is a common mistake. For most people who form calcium stones, eating normal amounts of calcium from food actually helps lower stone risk, because calcium binds oxalate in the gut before it reaches the kidneys. The evidence supports dietary calcium rather than restriction. Calcium supplements are a different question and should be discussed with a clinician.

Can You Prevent Kidney Stones From Forming Again?

Prevention is real but not guaranteed. The strongest evidence supports drinking enough fluid to produce pale, plentiful urine. Many clinicians suggest aiming for roughly 2 to 3 liters of fluid a day for people who form stones, though the right amount depends on the person and should be set with a clinician.

Diet changes that have reasonable support include limiting sodium, moderating animal protein, and getting calcium from food rather than avoiding it. For uric acid stones, reducing purine-rich foods may help. For some people, medications such as thiazide diuretics or allopurinol are prescribed based on urine testing, but these are individualized decisions, not general advice.

There is no single diet that prevents all stones, because different stones have different causes. A prevention plan built around your specific stone type and urine results is more likely to help than a generic one.

The Bottom Line

Small kidney stones often pass on their own, and the pain usually ends once the stone is out. Larger stones, stones that block urine flow, or stones with infection need medical treatment. And having one stone is a signal to look at why it formed, because the tendency to make more does not usually go away by itself.