Stages of Passing a Kidney Stone — Explained by Medical Evidence, Not Myths

The stages of passing a kidney stone usually follow a pattern: the stone forms or shifts in the kidney, enters the ureter and causes pain, reaches the bladder with increasing urgency, and finally leaves the body through urine. The exact experience varies by stone size, shape, location, and whether there is blockage or infection.

Overview: What the stages of passing a kidney stone really mean

The stages of passing a kidney stone are best understood by looking at where the stone is in the urinary tract, not by myths about how long it should take or how much pain it must cause. In general, a stone may begin in the kidney without symptoms, then trigger pain as it enters the ureter, cause urinary urgency as it approaches the bladder, and finally pass out through the urethra in the urine.

Not every stone follows a dramatic pattern. Some very small stones pass with only mild discomfort, while others cause sudden waves of severe pain called renal colic. The amount of pain does not always predict the stone’s size, because even a small stone can cause intense symptoms if it blocks urine flow or irritates the ureter.

Stones are made of crystallized minerals and salts. The most common types include calcium oxalate, calcium phosphate, uric acid, struvite, and cystine stones. Although the passage experience can feel similar across stone types, identifying the stone later can help guide prevention and reduce the chance of recurrence.

Stage 1: A stone forms or shifts inside the kidney

The first stage often happens quietly. A stone may develop gradually in the kidney as minerals become concentrated in the urine and form crystals. Many people do not know they have a kidney stone until it moves or is found during imaging for another reason.

If symptoms occur at this stage, they may be vague. A person might notice a dull ache in the back or side, blood in the urine, or no symptoms at all. Sometimes stones stay in the kidney for a period of time without causing blockage, especially if they are small and not lodged in a narrow area.

This stage matters because the stone’s size and shape begin to influence what comes next. Very small stones are more likely to pass on their own. Larger stones or stones with rough edges may be more likely to get stuck and produce stronger symptoms once they leave the kidney.

Stage 2: The stone enters the ureter and pain often peaks

The ureter is the narrow tube that carries urine from the kidney to the bladder. When a stone drops into the ureter, it may partly block urine flow and stretch the urinary tract. This is the point when many people experience the classic sudden, cramping pain of a kidney stone.

Pain is usually felt in the side or back below the ribs and may come in waves rather than staying constant. It can radiate toward the lower abdomen, groin, testicle, or labia as the stone moves downward. Nausea, vomiting, sweating, and restlessness are also common during this stage because the body is reacting to intense pain and ureter spasm.

Blood in the urine may appear pink, red, or brown. Some people also feel burning with urination, but this symptom alone does not prove a stone has reached the bladder. When a stone causes marked blockage, the kidney can swell and pain may remain severe until the stone changes position or receives treatment.

If symptoms suggest a stone, doctors may use urine testing, blood tests, and imaging such as ultrasound or CT to confirm the diagnosis and assess obstruction. This evaluation also helps distinguish stones from other causes of flank pain, including kidney conditions or infection.

Stage 3: The stone moves lower and bladder symptoms become more noticeable

As the stone travels down the ureter and nears the bladder, the pattern of symptoms can change. Some people notice that the severe side pain eases, then returns in waves. Others begin to feel pressure in the lower abdomen or an urgent need to urinate frequently, even if the bladder is not very full.

This stage can be confusing because it may resemble a urinary tract infection. There may be burning, urinary frequency, or the sense of needing to urinate again right after finishing. However, stones and infections can also occur together, which is why fever, chills, cloudy urine, or worsening illness should never be ignored.

Once the stone enters the bladder, pain often improves significantly because the bladder is wider than the ureter. Still, the person may continue to feel irritation until the stone leaves the body. In some cases, the stone lingers in the bladder briefly before being passed during urination.

Stage 4: The stone passes through the urethra and leaves the body

The final stage is the actual passage of the stone in the urine. This may happen with little warning, especially for a very small stone. Some people feel a brief sting or sharp discomfort during urination, while others notice only that symptoms quickly improve afterward.

The stone may be visible in the urine or caught by using a urine strainer. Saving the stone can be helpful because laboratory analysis may identify its composition. That information can guide prevention steps such as changing fluid intake, reviewing diet, or evaluating metabolic causes.

It is important to remember that symptom relief does not always guarantee complete passage. A stone can shift and feel better temporarily without fully leaving the urinary tract. If pain, blood in the urine, or urinary symptoms continue, follow-up testing may be needed to confirm whether the stone has passed.

What affects how long it takes and how it feels

There is no single timeline for passing a kidney stone. Some stones pass in days, while others take weeks or do not pass without treatment. The main factors are stone size, shape, and exact location, along with how much blockage is present and whether the ureter relaxes enough to let the stone move through.

Smaller stones are more likely to pass spontaneously than larger ones. Stones lower in the ureter are also often closer to exiting the body, which may improve the chance of natural passage. Hydration can support urine flow, but drinking excessive amounts very quickly does not force a stuck stone out and may increase discomfort in some situations.

Certain conditions can complicate passage, including a single functioning kidney, pregnancy, repeated stones, structural narrowing of the urinary tract, or infection. People with recurrent stone disease may benefit from a broader evaluation for underlying causes. This is especially important in those with repeated kidney stones or a family history of stone formation.

• Stone size and shape
• Location in the kidney, ureter, or bladder
• Degree of urinary blockage
• Presence of infection
• Personal history of stones or urinary tract problems

Diagnosis and treatment based on the stone’s stage

Doctors diagnose kidney stones by combining symptoms with tests. A urine test may show blood, crystals, or signs of infection. Blood tests can check kidney function and look for problems such as dehydration or elevated substances linked to stone formation. Imaging helps locate the stone and determine whether there is obstruction.

Treatment depends on whether the stone is likely to pass safely on its own. For small stones without infection or serious blockage, care often includes pain relief, fluids, anti-nausea medicine if needed, and sometimes medication that helps relax the ureter. A doctor may advise watching for the stone to pass and returning for follow-up imaging.

If the stone is too large, causes ongoing blockage, leads to infection, or the pain cannot be controlled, a procedure may be needed. Options can include ureteroscopy, shock wave lithotripsy, or in selected situations percutaneous nephrolithotomy. The best choice depends on the stone’s size, location, and the person’s overall health.

After the immediate episode, prevention becomes part of treatment. Stone analysis, urine studies, and review of diet or medical conditions can help reduce future episodes. For people with repeated or complex stones, management may involve urology specialists familiar with both acute care and long-term prevention.

Prevention, self-care, and when to seek medical care

Self-care during stone passage should focus on safe symptom control and hydration. Drinking enough fluid to avoid dehydration is generally helpful, unless a doctor has given different advice due to another medical condition. Rest, prescribed or recommended pain medicines, and straining the urine for stone capture may also be part of home care.

Long-term prevention often includes increasing daily fluid intake, limiting excess sodium, and adjusting the diet based on stone type. Some people may need medicines to lower recurrence risk, especially if stones are related to uric acid, calcium imbalance, or other metabolic factors. Because prevention is individualized, broad internet advice should not replace medical guidance.

Medical care should be sought promptly for fever, chills, severe or worsening pain, repeated vomiting, blood in the urine that is heavy or persistent, inability to urinate, or symptoms in someone with one kidney, pregnancy, or known kidney disease. These signs can suggest obstruction, dehydration, or infection and should be assessed quickly.

For international patients who need evaluation or treatment, Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and manage urinary stone disease, including kidney stone treatment when appropriate. The safest next step is always an assessment by a qualified clinician rather than relying on myths about how a stone should pass.

Frequently asked questions

How do the stages of passing a kidney stone usually progress?

Most stones start in the kidney, then cause more noticeable symptoms when they move into the ureter. As they get closer to the bladder, urgency and urinary discomfort may increase, and the final stage is passage through the urine. The order is similar for many people, but the timing and intensity vary.

Does pain mean the stone is about to come out?

Not always. Pain often becomes strongest when the stone is in the ureter, especially if it blocks urine flow. A stone may still take time to pass after pain starts, and sometimes pain improves before the stone has fully exited.

How long does it take to pass a kidney stone?

There is no single answer because passage depends mainly on the stone’s size and location. Some small stones pass within days, while others take weeks or need a procedure. A doctor can give a better estimate after imaging.

Can a kidney stone pass without severe pain?

Yes. Some small stones cause only mild discomfort or no symptoms at all. Others produce intense pain, so the experience is very individual and does not always reflect how serious the stone is.

What are signs that a kidney stone might be an emergency?

Fever, chills, vomiting that prevents fluid intake, severe uncontrolled pain, inability to urinate, or symptoms in someone with one kidney need urgent medical attention. These can signal infection, dehydration, or significant blockage. Prompt assessment is important to protect kidney function and overall health.

Should a person drink a lot of water to push the stone out?

Staying well hydrated is generally helpful, but forcing excessive amounts of water quickly is not always useful. It does not guarantee that a stuck stone will move and may worsen discomfort in some cases. Fluid advice should fit the person’s overall health and medical guidance.

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.