Can A Kidney Stone Pass On Its Own?

Yes, many small kidney stones can pass without a procedure, but size, location, and symptoms decide when you need care.

A kidney stone can feel like a tiny object causing a giant problem. Plenty of stones do exit the body without surgery. The tricky part is knowing when waiting is safe and when waiting turns into risk.

Below you’ll learn what affects a stone’s odds of passing, what passing tends to feel like, what to do at home, and when to get urgent medical help.

Passing A Kidney Stone On Its Own: What Decides It

Self-passage mostly comes down to where the stone is, how big it is, and how your urinary tract is reacting. Pain level matters too, since uncontrolled pain is hard to manage outside a clinic.

Stone size and shape

Size is the biggest driver. Small stones can slip through the ureter and out in urine. Larger stones can get stuck and trigger spasms that squeeze the ureter tighter. Shape can add friction, so a rough stone may hurt more than a smooth stone of similar size.

Stone location

Stones can sit in the kidney without drama, then cause sudden symptoms once they enter the ureter. That’s when many people feel flank pain that can move toward the lower belly or groin. A stone closer to the bladder may pass sooner than one near the kidney because it has less distance to travel.

Your symptoms and health history

Swelling, dehydration, infection, and prior narrowing in the urinary tract can change the odds. People with one kidney, pregnancy, kidney disease, or repeated stones are often managed more cautiously.

What Passing Usually Feels Like

Passing a stone is often a series of shifts. Pain can spike, ease, then spike again. That pattern can be unnerving, yet it can mean the stone is moving.

Common symptoms during passage

• Sharp pain in the side or back
• Nausea or vomiting during pain peaks
• Blood-tinged urine
• Frequent urge to urinate once the stone nears the bladder
• Burning with urination when the stone is close to exiting

Mayo Clinic notes that stones may not cause symptoms until they move into the ureter, and symptoms can include severe pain, nausea, vomiting, fever, chills, and blood in the urine. Mayo Clinic’s kidney stone symptoms overview is a quick reference for a symptom check.

Why the pain can be so intense

The ureter is a narrow, muscular tube. When a stone presses against it, the ureter can spasm and swell. Urine can back up behind the blockage, stretching the kidney’s drainage system and triggering strong pain signals.

How Long Can It Take To Pass A Stone?

Some stones pass in a day. Others take weeks. Time depends on size, location, and swelling. Even when a stone is likely to pass, the waiting period can be the toughest part.

NHS guidance says small kidney stones may be treated at home and that pain can last until you pass the stone, which can take a few weeks. NHS kidney stone treatment guidance also points to pain relief and fluids as common parts of home care for small stones.

Ways To Boost Your Odds While Waiting

If you’re in the “likely to pass” group, the goal is to keep urine flowing, manage pain safely, and watch for danger signs. You’re not trying to force the stone through with risky tricks.

Hydration that’s steady

Drinking fluids helps keep urine moving. That movement can help a small stone travel. Still, chugging huge amounts at once can trigger nausea or worsen pain during a spasm. Aim for frequent sips through the day. If you’re vomiting and can’t keep fluids down, get checked.

Pain control that keeps you functional

Anti-inflammatory pain medicine is often used for renal colic when it’s safe for you, since it can reduce both pain and swelling. If you have kidney disease, stomach ulcers, take blood thinners, or have other limits, ask a clinician what fits your history. Heat, like a warm bath or heating pad, can take the edge off during a pain wave.

Straining your urine

If you catch the stone, you can bring it in for analysis. Knowing the stone type helps guide prevention later.

When A Stone Is Less Likely To Pass By Itself

Some situations make self-passage less likely or less safe. A stone can be too large to fit through the ureter. It can lodge in a way that blocks urine. Or it can be paired with infection, which is an emergency.

What You Notice	What It Can Mean	Typical Next Step
Severe pain that breaks through medication	Ongoing spasm or blockage	Same-day evaluation for stronger pain control and imaging
Fever or chills	Possible infection with blockage risk	Urgent care or ER assessment
Vomiting that stops you from drinking	Dehydration risk; pain not controlled	Medical assessment for fluids and nausea control
Very little urine or trouble peeing	Possible obstruction	Urgent evaluation to protect kidney function
Known large stone on imaging	Low chance of spontaneous passage	Discuss procedure options and timing
Single kidney, pregnancy, or known kidney disease	Lower margin for delay	Earlier follow-up and a tailored plan
Cloudy urine with pain	Possible infection	Prompt testing and treatment
Pain plus confusion, fainting, or marked weakness	Dehydration, infection, or severe pain response	Emergency evaluation

MedlinePlus lists warning signs that call for a doctor’s help, like pain that won’t go away, blood in urine, fever and chills, vomiting, cloudy urine, and burning when you urinate. MedlinePlus on kidney stones is a clear checklist when you’re deciding what to do next.

What Clinicians Do When Waiting Isn’t Working

If a stone isn’t passing, care usually starts with confirming stone size and location, then matching treatment to what’s happening. Imaging and urine tests can also help spot infection and kidney strain.

Tests you may be offered

Most clinics start by checking your urine for blood and signs of infection, then use imaging to locate the stone. A CT scan can show size and position clearly. An ultrasound may be used in some cases, especially when limiting radiation matters. Blood tests can check kidney function and look for changes that point to dehydration or infection.

If you’ve been told to wait and pass the stone at home, ask what symptoms should change your plan, when you should return for repeat imaging, and how long they’re comfortable letting you try to pass it before switching tactics. Getting those boundaries up front can calm a lot of uncertainty.

Medicine that may help a ureter relax

In some cases, a clinician may prescribe medicine that helps the ureter relax and may help a ureteral stone pass. This is often paired with pain control and close follow-up.

Procedures that remove or break up the stone

If a stone is stuck, a clinician may recommend a procedure to remove it or break it into smaller pieces. Options can include shock wave treatment or a scope passed through the urinary tract. NIDDK notes that treatment decisions depend on size, location, and stone type, and that small stones may pass without treatment. NIDDK’s treatment for kidney stones lays out that approach.

Relief of blockage when infection is suspected

If urine flow is blocked and infection is present, clinicians may focus first on draining the kidney, since that protects kidney function and helps antibiotics work.

What Not To Do While Trying To Pass A Stone

• Don’t take leftover antibiotics “just in case.” Infection needs the right medicine and testing.
• Don’t push extreme water chugging that leads to vomiting.
• Don’t ignore fever, chills, or low urine output.
• Don’t keep riding out uncontrolled pain for days.

How To Tell If The Stone Has Passed

Sometimes you’ll see the stone. Sometimes you won’t. A drop in flank pain can mean the stone moved into the bladder, where it often causes less back pain and more urinary urgency. Then it exits during urination.

Clues that point to passage

• Pain shifts lower, then eases
• Sudden relief after a sharp urinary sting
• Gravel-like specks in a strainer
• Urine flow feels normal again

If your stone was found on imaging, a follow-up can confirm it’s gone and check for remaining stones.

Lowering The Odds Of Another Stone

Many people who form one stone form another later. Prevention depends on stone type, hydration habits, and medical conditions. If you can catch the stone, analysis can guide the next steps.

Daily habits that help many stone types

• Drink fluids through the day so your urine stays light in color
• Moderate salt intake
• Balance animal protein intake
• Ask about a 24-hour urine test after repeat stones

Goal	What You Can Do	When To Get Checked
Stay hydrated	Drink fluids in small, steady amounts	Same day if you can’t keep fluids down
Manage pain safely	Use clinician-approved pain medicine; add heat if it helps	Urgent care if pain breaks through medication
Confirm stone type	Strain urine and save the stone for analysis	Book follow-up after passage or treatment
Reduce repeat risk	Review diet and labs with a clinician	Ask about prevention meds after repeat stones
Spot emergencies	Watch for fever, chills, low urine, confusion, fainting	ER if fever/chills or blocked urine occur

If you’re unsure where you stand, don’t white-knuckle it alone. A quick evaluation can sort “likely to pass” from “needs treatment,” and that clarity can save days of pain.