What Does Passing a Kidney Stone Feel Like?

The pain usually starts in the middle of the night or during something completely ordinary — driving home from work, standing in line at the grocery store. A dull ache settles low in the back, just below the ribs, on one side. Within twenty or thirty minutes, that ache turns into something else entirely. It comes in waves, builds to a peak that makes it hard to sit still, and refuses to be relieved by any position. People describe pacing the bedroom, kneeling on the bathroom floor, getting in and out of the shower. Nothing helps.

That progression is what most people are asking about when they want to know what does passing a kidney stone feel like. The sensation is distinctive, and once you’ve felt it, it’s hard to confuse with anything else. But in the early hours, before the pattern becomes obvious, it can mimic a pulled muscle, a stomach bug, or appendicitis. Understanding the actual sequence of sensations — where the pain starts, how it moves, and what comes with it — can help you figure out what’s happening and decide what to do next.

Why kidney stones hurt the way they do

A kidney stone is a hard crystallized deposit that forms inside the kidney. By itself, sitting in the kidney, a stone often causes no pain at all. People can carry stones for years without knowing. The pain begins when a stone moves into the ureter — the narrow tube that drains urine from the kidney to the bladder. The ureter is roughly the diameter of a thin coffee stirrer. When a stone tries to pass through, it stretches the wall, blocks urine flow, and triggers spasms in the surrounding muscle.

That combination — stretching, obstruction, and spasm — is what produces the kind of pain people remember for the rest of their lives. The medical term is renal colic, which simply means pain that comes in waves from the urinary tract. Surveys of patients who’ve experienced both often rank it alongside or above childbirth.

Where the pain actually shows up

Kidney stone pain location depends on where the stone is sitting at the moment. The pain tends to migrate as the stone moves, which is one of its more telling features.

Flank pain — a deep, severe ache in the back between the lower ribs and the hip, almost always on one side. This is usually the first sign.
Side and abdominal pain — as the stone moves down the ureter, the pain wraps around the side toward the lower abdomen.
Groin pain — when the stone gets closer to the bladder, the pain often shoots into the lower belly, groin, or genitals. Men may feel it in the testicle on the same side; women may feel it radiate toward the labia.
Burning with urination and urgency — once the stone reaches the lowest part of the ureter, near the bladder, urinating can sting and the urge to go becomes constant, even when the bladder is nearly empty.

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The stages of passing a kidney stone

The stages of passing a kidney stone don’t follow a strict clock — some stones move quickly, others stall for days. But the general arc tends to look like this.

Stage 1: The stone leaves the kidney

This is when most people first feel something. The pain comes on suddenly, often without warning, and climbs to peak intensity within thirty minutes to a couple of hours. It’s a deep, cramping ache in the flank that doesn’t ease with movement, stretching, or lying still. Many people feel nauseated and may vomit. Some break into a sweat. The waves typically last twenty to sixty minutes, ease briefly, and then return.

Stage 2: The stone travels through the ureter

This is usually the longest and most painful stretch. The ureter is narrowest in a few specific spots, and stones often get hung up there. Pain shifts from the back to the side to the lower abdomen as the stone descends. Episodes of intense pain alternate with periods of dull soreness. This stage can last anywhere from a few hours to several weeks, depending on the size of the stone. Stones smaller than 4 millimeters pass on their own most of the time. Stones larger than 6 or 7 millimeters often need help.

Stage 3: The stone reaches the bladder

Once a stone drops into the bladder, the severe colicky pain usually eases dramatically. What replaces it is bladder irritation — a frequent, urgent need to urinate, sometimes with a burning sensation, and occasionally blood-tinged urine. People often think the worst is over at this point, and usually it is.

Stage 4: The stone exits through the urethra

The final passage out of the body, through the urethra, is brief. In men, the urethra is longer and narrower, so there can be a sharp stinging sensation at the tip during urination. In women, the urethra is short and the exit is often barely noticeable. Many people don’t actually see the stone come out — they only know it’s gone because the pain stops.

Other kidney stone pain symptoms to watch for

Pain is the headline, but it’s rarely the only symptom. How to know if you’re passing a kidney stone usually comes down to a cluster of signs showing up together:

Pink, red, or brown urine from microscopic or visible blood
Cloudy or foul-smelling urine
Nausea and vomiting that tracks with the waves of pain
Restlessness — an inability to find a comfortable position, which is fairly specific to renal colic (people with appendicitis or peritonitis tend to lie very still)
Urinating in small amounts more often than usual
A low-grade fever or chills, though high fever is a red flag for infection

Not every stone produces every symptom. Small stones can pass with just a few hours of moderate discomfort and a streak of blood in the urine. Larger stones can cause days of misery.

When to go to the ER for a kidney stone

Most kidney stones can be managed at home with fluids, pain medication, and patience. But there are situations where waiting it out is the wrong call. Knowing when to go to ER for kidney stone symptoms is genuinely important, because an obstructed kidney combined with infection can become a medical emergency within hours.

Head to the emergency department, or call your doctor for urgent guidance, if any of the following are happening:

Fever above 101°F (38.3°C), shaking chills, or feeling genuinely sick beyond the pain itself — this can signal an infected, blocked kidney
Pain that can’t be controlled with over-the-counter medication
Persistent vomiting that prevents you from keeping fluids down
Little or no urine output
Heavy blood in the urine, or passing clots
Only one functioning kidney, a transplanted kidney, or known kidney disease
Pregnancy with suspected stone symptoms
Severe pain that lasts more than a few hours without relief between waves

The honest answer is that even when none of those red flags are present, a first-time stone is worth a same-day evaluation. Imaging confirms the diagnosis, rules out other causes of severe flank pain, and tells you how big the stone is — which is the single most useful piece of information for predicting whether it will pass on its own.

What home management actually looks like

If a clinician has confirmed a small stone and cleared you to manage it at home, the basics are straightforward. Drink enough water to keep urine pale yellow — usually two to three liters a day. Use anti-inflammatory pain medication such as ibuprofen if your doctor says it’s safe for you, since it tends to work better than acetaminophen for this type of pain. Stay active when you can; lying motionless doesn’t help the stone move. Strain your urine through a fine mesh or coffee filter so you can catch the stone for analysis, which guides prevention of future stones.

Some clinicians prescribe a medication called tamsulosin to relax the ureter and help the stone pass more easily, especially for stones in the lower ureter. The evidence is mixed for very small stones but generally favorable for stones in the 5 to 10 millimeter range.

So what does passing a kidney stone feel like in the end

The short version: severe, wave-like pain that starts in the flank, moves toward the groin, and is usually accompanied by nausea, restlessness, and changes in urination. The long version is a process that can last hours or weeks, with stages that shift as the stone travels. Most stones pass without surgery. A meaningful number need medical help. And almost everyone who has gone through it remembers exactly where they were when it started.

If the symptoms described here sound like what’s happening right now, the safest next step is a call to your doctor or a visit to urgent care or the emergency department — particularly if it’s the first episode, the pain is severe, or fever has entered the picture.

Medical Disclaimer: This content is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always consult your physician or a qualified healthcare provider with any questions about a medical condition.