Can a 5 mm Kidney Stone Pass Naturally?
A 5 mm kidney stone can pass naturally, but it depends mainly on the stone’s location, pain severity, infection risk and kidney function. A 5 mm stone in the lower ureter — the urine tube close to the bladder — has a better chance of passing than a stone near the kidney. Waiting may be safe only if pain is controlled, there is no fever, kidney function is normal and follow-up imaging is planned. Fever, repeated vomiting, severe pain, kidney swelling, single kidney or raised creatinine needs urgent urology evaluation.
Can a 5 mm kidney stone pass naturally?
Yes, a 5 mm stone can pass naturally. But it is a borderline-size stone.
Very small stones, such as 2-3 mm stones, often pass more easily. A 5 mm stone may pass, especially when it has travelled down into the lower ureter. But it can also get stuck and cause repeated pain, swelling of the kidney or infection.
Stone size and location are important predictors of natural passage. Published CT-based data show that many 5 mm ureteric stones pass spontaneously, but the chance decreases as stone size increases and when the stone is higher up in the ureter.
Kidney stone or ureter stone: why location matters
Many patients call every urinary stone a “kidney stone.” But for natural passage, the exact location is very important.
| Stone location | What it means | Chance of natural passage |
|---|---|---|
| Inside the kidney | Stone is still in the kidney collecting system | May stay silent or move later |
| Upper ureter | Stone is in the urine tube near the kidney | Lower chance |
| Mid ureter | Stone is halfway down the urine tube | Moderate chance |
| Lower ureter | Stone is near the bladder | Better chance |
| UVJ stone | Stone is at the bladder opening | Often painful, but may pass |
Guidelines note that spontaneous passage depends on stone size and ureteric location. Distal ureteric stones usually pass more often than upper ureteric stones.
Why some 5 mm stones pass and others do not
A 5 mm stone is not judged by size alone. Your urologist looks at the full picture.
Stone location
A 5 mm lower ureteric stone has a better chance of passing than a 5 mm upper ureteric stone.
Stone shape
A smooth stone may move more easily. A rough, spiky or impacted stone may irritate the ureter and remain stuck.
Swelling around the stone
The ureter can become swollen around the stone. This narrows the passage and may increase pain.
Hydronephrosis
Hydronephrosis means swelling of the kidney due to urine blockage. Mild swelling may be observed in selected patients. Severe or worsening swelling needs closer attention.
Infection
A stone with fever is not a simple pain problem. It may mean infection behind a blockage, which can become dangerous.
Kidney function
If creatinine is rising, urine output is reduced, both kidneys are blocked or the patient has a single functioning kidney, waiting may be unsafe. Persistent pain, persistent obstruction and renal insufficiency are common reasons to consider stone removal.
Symptoms of a 5 mm stone trying to pass
A 5 mm ureteric stone may cause:
- Sudden severe pain in the side or back.
- Pain moving to the lower abdomen, groin or testis/labia.
- Burning while passing urine.
- Frequent urge to pass urine.
- Blood in urine.
- Nausea or vomiting.
- Restlessness during pain.
- Pain that comes in waves.
Kidney stone pain is commonly described as sharp, cramping pain in the back or side that may move toward the lower abdomen or groin.
When is it reasonable to wait?
Waiting may be reasonable if all of these are true:
- Pain is controlled with medicines.
- There is no fever or chills.
- Vomiting is not persistent.
- Urine infection is absent or treated.
- Serum creatinine is normal.
- There are two functioning kidneys.
- Kidney swelling is mild or stable.
- The stone is likely to pass based on CT/USG findings.
- The patient can return for follow-up.
This approach is called conservative management. If medicines are used to help the ureter relax and support stone passage, it is called medical expulsive therapy. Alpha blockers may be considered for selected distal ureteric stones when active removal is not immediately required.
The 5 mm stone decision box
For a 5 mm stone, the best question is not only: “Will it pass?” The safer question is: “Is it safe for me to wait?”
| Situation | Usual direction |
|---|---|
| Lower ureter stone, controlled pain, no fever, normal creatinine | Observation may be possible |
| Upper ureter stone with repeated pain | Closer follow-up or treatment may be needed |
| Fever with stone pain | Emergency evaluation |
| Persistent vomiting | Do not wait at home |
| Single kidney or raised creatinine | Urgent urology evaluation |
| Severe hydronephrosis | Active treatment may be needed |
| Stone not moving on follow-up | Treatment may be discussed |
When should you not wait for a 5 mm stone to pass?
Do not wait at home if you have:
- Fever.
- Chills or shivering.
- Severe pain not controlled with medicines.
- Persistent vomiting.
- Reduced urine output.
- Single kidney.
- Raised creatinine.
- Pregnancy.
- Uncontrolled diabetes with infection symptoms.
- Severe kidney swelling.
- Repeated emergency visits for stone pain.
- Stone not moving on follow-up scans.
Early surgical treatment may be advised when pain is ongoing and not tolerated, or when the stone is unlikely to pass safely.
Emergency signs: go to hospital urgently
A 5 mm stone can become dangerous if it blocks the kidney and infection develops behind the blockage.
Seek urgent care if you have:
- Fever with kidney stone pain.
- Chills or shivering.
- Persistent vomiting.
- Severe weakness or confusion.
- Very severe pain despite medicines.
- Inability to pass urine or reduced urine output.
- Fainting or low blood pressure.
- Stone pain in a single kidney patient.
- Pregnancy with severe stone pain.
| Important:A kidney stone with fever, urine blockage or reduced kidney function should not be managed at home. |
|---|
In these cases, the first step may be urgent drainage with a DJ stent or percutaneous nephrostomy. Definitive stone treatment is usually planned after stabilisation.
What tests are needed for a 5 mm kidney stone?
Your urologist may advise tests depending on pain, fever, stone location and previous reports.
Urine routine and microscopy
This checks for blood, pus cells, crystals and infection clues.
Urine culture
This is important if there is fever, burning urination, pus cells in urine or recurrent infection.
Serum creatinine
This checks kidney function.
CBC
This may be needed if infection is suspected.
Ultrasound KUB
Ultrasound can show kidney swelling and many kidney stones. It may miss some ureteric stones.
CT KUB
A non-contrast CT KUB is the most accurate test for stone size, location and obstruction. Low-dose CT is commonly used for adults with suspected renal colic, while ultrasound is preferred first in pregnancy and children.
Medicines that may be used
Medicines depend on your symptoms, kidney function and other medical conditions. Your doctor may prescribe:
- Pain-relief medicines.
- Anti-vomiting medicines.
- Alpha blockers for selected lower ureteric stones.
- Antibiotics only if infection is suspected or proven.
- Urine alkalisation medicines in selected uric acid stones.
Do not self-medicate with repeated painkillers, antibiotics or “stone dissolving” remedies. Some medicines can harm the kidney, especially if there is dehydration, obstruction or pre-existing kidney disease.
Does drinking more water push out a 5 mm stone?
Adequate hydration is helpful, but forceful water drinking is not a guaranteed solution.
If you are comfortable and not vomiting, drinking enough fluids may help maintain urine flow. But during severe colic pain, forcing large amounts of water may worsen discomfort.
Small stones may pass without treatment, and a healthcare professional may advise fluids, pain medicine and collecting the stone for analysis once it passes.
What if the 5 mm stone does not pass?
If the stone does not pass or causes repeated symptoms, active treatment may be needed.
Medical expulsive therapy
This may be tried for selected lower ureteric stones when there are no danger signs.
ESWL / shockwave lithotripsy
Shockwaves are used from outside the body to break selected stones into smaller fragments. It may be suitable for some kidney stones and selected upper ureteric stones.
URSL / ureteroscopy
A small scope is passed through the urinary passage into the ureter. The stone is broken with laser and fragments are removed. A temporary DJ stent may be placed.
RIRS
For selected kidney stones, a flexible scope is passed into the kidney and laser is used to dust the stone.
The best option depends on stone location, stone density, kidney swelling, infection, anatomy, previous procedures and patient preference.
Consultation checklist: what to bring
Bring these reports if available:
- USG KUB report.
- CT KUB film/report.
- X-ray KUB, if done.
- Urine routine report.
- Urine culture report.
- Serum creatinine.
- CBC, if fever or infection.
- Previous stone surgery records.
- Current medicines.
- Discharge summary, if admitted earlier.
- The passed stone, if collected.
FAQs
1. Can a 5 mm kidney stone pass naturally?
Yes. A 5 mm kidney stone can pass naturally, especially if it is in the lower ureter. But it needs monitoring because it can also get stuck.
2. Is a 5 mm kidney stone big?
It is not a very large stone, but it is not tiny either. A 5 mm stone is a borderline-size stone where natural passage is possible but not guaranteed.
3. Can a 5 mm stone pass without surgery?
Yes, many 5 mm stones can pass without surgery. Surgery may be needed if there is fever, uncontrolled pain, vomiting, kidney swelling, raised creatinine or failure to pass.
4. How long does a 5 mm kidney stone take to pass?
Some pass within days, while others may take a few weeks. Do not wait for many weeks without follow-up imaging, especially if pain continues.
5. What is better for a 5 mm stone: medicine or laser?
For a lower ureteric 5 mm stone with controlled symptoms, medicines may be tried. If pain is repeated, infection is present, kidney swelling worsens or the stone does not move, laser treatment through ureteroscopy may be better.
6. Should I drink more water to pass a 5 mm stone?
Drink adequate water if you are not vomiting and your doctor has not restricted fluids. Do not force excessive water during severe pain.
7. Can home remedies dissolve a 5 mm kidney stone?
Most calcium stones do not dissolve with home remedies. Some uric acid stones may respond to urine alkalisation under medical supervision. Do not depend on unverified remedies if pain, fever or blockage is present.
8. When should I see a urologist for a 5 mm kidney stone?
See a urologist if pain is severe, fever is present, vomiting continues, urine output reduces, creatinine is high, kidney swelling is seen or the stone has not passed on follow-up.
Related reading
- Kidney Stone Pain: Location, Symptoms and Relief
- Can a 4 mm Kidney Stone Pass Naturally?
- Can a 6 mm Kidney Stone Pass Naturally?
- Fever with Kidney Stone Pain: When to Go to Hospital Immediately
- Blood in Urine Due to Kidney Stone: Is It Serious?
- Kidney Stone Treatment in Latur
- URSL Surgery in Latur
References
- European Association of Urology. EAU Guidelines on Urolithiasis https://uroweb.org/guidelines/urolithiasis/chapter/guidelines
- NICE Guideline NG118. Renal and ureteric stones: assessment and management https://www.nice.org.uk/guidance/ng118/chapter/recommendations
- Urology Care Foundation. Kidney Stones: Symptoms, Diagnosis & Treatment https://www.urologyhealth.org/urology-a-z/k/kidney-stones
- NIDDK. Treatment for Kidney Stones https://www.niddk.nih.gov/health-information/urologic-diseases/kidney-stones/treatment
- Jendeberg J, Geijer H, Alshamari M, et al. Size matters: the width and location of a ureteral stone accurately predict the chance of spontaneous passage. European Radiology https://pubmed.ncbi.nlm.nih.gov/28593428/