Kidney Stone of 5 mm: Symptoms, Treatment Options, and Chances of Passing Naturally

A 5 mm kidney stone sits in the middle zone. It is not tiny, but it is also not automatically a surgery case. Some patients pass it naturally, while others struggle because the stone gets stuck in the ureter and causes repeated renal colic. What matters most is stone location, urine blockage, and whether infection is present.

Overview: 5mm Kidney Stone

A kidney stone measuring 5 mm is often described as borderline. Many patients can pass it naturally, with studies commonly showing a high passage rate of 50-70%. Since the ureter is usually about 3–4 mm wide, a 5 mm stone may get stuck, especially near the UVJ (ureterovesical junction). Passage depends on stone location, hydration, ureteral movement (ureteral peristalsis), and the use of Medical Expulsive Therapy (MET) such as alpha-blockers (tamsulosin). Fever, repeated vomiting, severe pain, or reduced urine output need urgent medical review.

Is a 5 mm Kidney Stone Considered Large? A 5 mm kidney stone is a medium-sized stone. A 5 mm stone can lodge in the ureter and cause repeated renal colic. Many patients also get confused because a “5 mm stone in the kidney” may not cause symptoms immediately, but once it starts moving, pain can become severe.

Symptoms of a 5 mm Kidney Stone

A 5 mm stone can irritate the ureter and slow urine flow, which is why symptoms often become intense.

Common symptoms include:

• Sudden flank pain (renal colic)

• Pain radiating to the lower abdomen or groin

• Pelvic pressure (especially near the UVJ)

• Burning while passing urine

• Frequent urination or urinary urgency

• Blood in urine (hematuria)

• Nausea or vomiting

• Pain that comes in waves

5 mm Stone Pain Location Guide

Pain often shifts as the stone moves down the ureter. That movement is what changes the pain location.

• Upper ureter: flank pain, back pain

• Middle ureter: side pain with lower abdominal discomfort

• Lower ureter / UVJ: pelvic pressure, groin pain, urinary urgency

This shifting pattern is typical of renal colic.

Can a 5 mm Kidney Stone Pass Naturally?

Yes. Passing a 5 mm stone naturally is possible. Many patients pass it without surgery, and the chance is often quoted around 50–70%, especially if the stone is already in the ureter and moving downward. Stones in the lower ureter usually pass more easily than stones stuck higher up.

Stone Size vs Spontaneous Passage Rate

These figures vary by location and ureteral swelling, but they give a practical idea of what to expect.

How Long Does It Take for a 5 mm Stone to Pass?

A 5 mm stone may pass in a few days, but it can also take 2–4 weeks. If pain keeps returning, vomiting starts, or urine output drops, waiting at home is not safe.

Doctors usually recommend follow-up if the stone has not moved or symptoms remain uncontrolled.

Treatment Options for a Kidney Stone of 5 mm

Treatment is selected based on symptoms, stone location, kidney function, and whether an infection or obstruction is present.

1. Conservative Management (Hydration + Pain Control)

If there is no fever and kidney function is stable, initial care is usually focused on pain control, hydration, and follow-up imaging to confirm that the stone is moving.

Urine straining may be advised to collect the stone for analysis.

2. Medical Expulsive Therapy (MET)

Medical Expulsive Therapy (MET) is used to help a 5 mm ureter stone pass by reducing ureter tightness and spasm.

Medication commonly used:

• Alpha-blockers (Tamsulosin): Tamsulosin is commonly prescribed for ureter stones to improve passage and reduce colic episodes in suitable patients.

3. Surgical Treatment (If the Stone Does Not Pass)

If pain remains uncontrolled, urine flow is blocked, infection develops, or the stone does not progress, a procedure may be required.

• Ureteroscopy (URS): A thin scope is passed through the urinary tract to remove the stone or break it.

• Laser Lithotripsy: Often done with URS to fragment the stone.

• ESWL (Shock Wave Lithotripsy): Used in selected cases depending on stone density and location.

Comparison: Conservative Management vs URS (Surgery)

 

How to Pass a 5 mm Stone Fast (Safely)

Many patients ask how to pass a 5 mm stone fast. The safest approach is pain control, hydration, and medical therapy when advised.

What may help:

• Drinking fluids throughout the day (unless vomiting is severe)

• Light activity if pain allows

• MET medicines only when prescribed

• Monitoring urine output
  

5 mm Kidney Stone Relief (What Patients Usually Need)

Pain from a 5 mm stone comes from ureter spasm and pressure buildup. Relief usually comes from controlling pain and avoiding dehydration. If vomiting prevents fluids or pain is not controlled, hospital care is needed.

When Should I Worry About a 5 mm Kidney Stone?

A 5 mm stone becomes risky when it causes infection or significant obstruction.

Go to the emergency room immediately if:

• Fever or chills occur

• Vomiting is repeated, or fluids cannot be kept down

• Pain is severe and not controlled

• Urine output becomes very low or stops

• Dizziness, confusion, or weakness develops

• Pregnancy is present

• Known kidney disease or a single functioning kidney is present

Fever with obstruction is a dangerous combination and needs emergency treatment.

5 mm Kidney Stone Treatment at NU Hospitals 

At NU Hospitals, the urology team confirms stone size and location before deciding whether observation, MET, or intervention is needed. Imaging such as USG KUB, and non-contrast CT KUB helps track stone movement and detect hydronephrosis early, so treatment is not delayed when obstruction is developing.

This approach is especially important for stones stuck near the UVJ, where pain and urinary urgency are often severe.

Kidney Stone Warning Signs and Expert Care at NU Hospitals

A 5 mm kidney stone can often pass naturally, but it may take time and can cause repeated renal colic. MET medicines like tamsulosin may improve passage in selected ureter stones.

Severe pain that does not settle, repeated vomiting, fever, or low urine output should be treated as urgent.

At NU Hospitals, our urology team follows standard stone management protocols to decide whether Medical Expulsive Therapy (MET) is safe or whether a procedure such as Ureteroscopy (URS) is needed.