Kidney stones can trigger temporary incontinence, but the mechanism depends on where the stone is and what it's doing

A kidney stone can cause incontinence in two distinct ways. First, a stone moving through your ureter (the tube carrying urine from kidney to bladder) can irritate the tissue and trigger sudden, urgent urges to urinate that you cannot hold—this is urge incontinence. Second, if a stone blocks urine flow partially or completely, urine backs up and stretches the bladder abnormally, which can also cause leakage or loss of control. The incontinence is usually temporary: once the stone passes or is removed, normal bladder function returns within days to weeks.

The incontinence from a kidney stone is not the same as the chronic incontinence that develops from nerve damage or muscle weakness. It is a symptom of the stone's presence, not a permanent change to your urinary system. However, if a stone causes a complete blockage and goes untreated for days, the backed-up urine can damage kidney tissue, which could lead to longer-term problems.

Key Takeaways

  • A kidney stone moving through the ureter irritates the tissue and triggers sudden, hard-to-control urges to urinate.
  • Incontinence from a kidney stone is usually temporary and resolves once the stone passes or is treated.
  • A blocked stone that prevents urine from draining is a medical emergency and requires urgent evaluation to prevent kidney damage.
  • Other symptoms—flank pain, blood in urine, nausea—often appear alongside incontinence and help distinguish a stone from other causes.

How a stone in the ureter causes urge incontinence

The ureter is a narrow muscular tube lined with sensitive tissue. When a kidney stone moves through it, the stone's rough surface scrapes the lining, causing inflammation and irritation. This irritation sends constant signals to your bladder and brain that urine is present and needs to be released—even when the bladder is not full. Your brain receives these false urgency signals and creates an intense, sudden urge to urinate that is difficult or impossible to suppress.

This type of incontinence—sudden leakage when you feel an urgent need to go—is called urge incontinence. It can happen during the day or night. Some people describe it as feeling like they need to urinate constantly, with small amounts leaking between bathroom trips. The severity depends on how much the stone irritates the tissue and how sensitive your individual nervous system is to that irritation.

What happens when a stone blocks urine flow

If a kidney stone lodges in the ureter and partially or completely blocks the flow of urine, the urine backs up into the kidney and bladder. The bladder stretches beyond its normal capacity as it fills with urine it cannot empty. This abnormal stretching weakens the bladder muscle and can cause leakage or loss of control, even when you are not feeling an urgent need.

A complete blockage is a medical emergency. When urine cannot drain, pressure builds inside the kidney within hours to days, and the kidney tissue can be permanently damaged. You will usually feel severe flank pain (pain on the side of your body below the ribs), and you may have fever, nausea, or vomiting. If you have these symptoms alongside incontinence, seek immediate medical attention. Do not wait to see if the stone passes on its own.

Other symptoms that point to a kidney stone

Incontinence alone is rarely the only sign of a kidney stone. Most people with a stone experience flank pain—often described as sharp, stabbing, or colicky (coming and going in waves). The pain can radiate down toward the groin as the stone moves. You may also see blood in your urine, either visible to the naked eye or detected only under a microscope during a urinalysis.

Nausea, vomiting, and the urge to urinate frequently are also common. If you have incontinence along with any of these symptoms—especially flank pain or blood in urine—a kidney stone is a reasonable possibility to explore with your doctor. Your doctor can order imaging (usually a CT scan without contrast, which is the gold standard for detecting stones) to confirm whether a stone is present.

How long incontinence lasts after a stone passes

Once a kidney stone passes completely out of your body through the urethra, the irritation to the ureter stops immediately. However, the tissue remains inflamed for a few days afterward, so the urge incontinence may persist for 24 to 72 hours even after the stone is gone. During this window, you may still feel sudden, intense urges to urinate and experience leakage.

If the stone was removed surgically or broken up with shock wave therapy (a procedure called lithotripsy), the timeline is similar: incontinence usually resolves within a few days as the inflammation subsides. If incontinence continues beyond a week after the stone has passed or been removed, talk to your doctor. Persistent incontinence after stone passage is uncommon and may point to a different underlying issue.

When to see a doctor about incontinence and possible kidney stones

Contact your doctor if you develop sudden incontinence alongside flank pain, blood in urine, or frequent urination. These symptoms together suggest a kidney stone or another urinary tract problem that needs evaluation. You do not need to wait for the incontinence to resolve on its own; imaging can confirm a stone quickly, and treatment can begin.

Seek immediate medical attention (go to an emergency room or call 911) if you have severe flank pain, fever, nausea and vomiting, or inability to urinate at all. These are signs of a blocked stone or infection, both of which can cause serious kidney damage if not treated urgently. Do not assume the incontinence will pass without intervention.

Treatment options for incontinence caused by kidney stones

Treatment depends on the size and location of the stone. Small stones (under 5 millimeters) often pass on their own with time and hydration; as the stone moves and eventually passes, the incontinence resolves. Your doctor may prescribe pain medication and anti-nausea medication to manage symptoms while you wait.

Larger stones or stones that cause a blockage may need to be removed or broken up. Common procedures include ureteroscopy (a thin camera is passed up the urethra to locate and remove or break apart the stone) and extracorporeal shock wave lithotripsy (sound waves break the stone into smaller pieces that can pass more easily). After any of these procedures, incontinence typically improves within days as inflammation decreases.

Frequently Asked Questions

Can a kidney stone cause permanent incontinence?

No. Incontinence from a kidney stone is temporary and caused by irritation or blockage. Once the stone passes or is removed and the tissue heals, normal bladder control returns. Permanent incontinence would suggest a different underlying problem, such as nerve damage or chronic bladder dysfunction.

What if I have incontinence but no pain?

A kidney stone can cause incontinence without severe pain in some people, especially if the stone is small or moving slowly. However, most people with a stone do feel some flank discomfort. If you have new incontinence without pain, your doctor should still evaluate you to rule out a stone and check for other causes.

Can I treat incontinence from a kidney stone at home?

You can manage discomfort with over-the-counter pain relief and by drinking plenty of water to help flush the stone, but you cannot treat the stone itself at home. If a stone is present, you need imaging to confirm it and medical guidance on whether it will pass on its own or needs removal. Do not delay evaluation.

How do I know if my incontinence is from a stone or something else?

Incontinence from a kidney stone usually appears suddenly alongside flank pain, blood in urine, or frequent urination. Chronic incontinence from other causes develops gradually. Imaging (CT scan) is the only way to know for certain whether a stone is present. Your doctor can order this based on your symptoms.