Kidney stones can be silent for months or years — and then, seemingly out of nowhere, cause some of the most intense pain a person will ever feel. Knowing the symptoms of a kidney stone can help you act quickly, get the right care, and avoid complications like infection or kidney damage.
This guide walks through the most common kidney stone symptoms, how they usually progress, differences you may notice between men and women, and clear signs that mean you should not wait to see a doctor.
How Kidney Stone Symptoms Usually Begin
Many kidney stones start silently. A stone can sit in the kidney for a long time without causing pain because the kidney has room for it and urine still flows freely. Symptoms usually begin when the stone starts to move — especially when it drops into the ureter, the narrow tube that carries urine from the kidney to the bladder.
When a stone gets stuck or partially blocks the ureter, urine backs up and pressure builds inside the kidney. That pressure, combined with the ureter squeezing to push the stone forward, produces the classic kidney stone pain known as renal colic.
The Most Common Kidney Stone Symptoms
Not every person feels every symptom, but these are the ones reported most often:
- Severe, cramping pain in the side or back, just below the ribs
- Pain that spreads to the lower abdomen and groin
- Pain that comes in waves and shifts as the stone moves
- Pain or burning during urination
- Pink, red, or brown urine (blood in the urine)
- Cloudy or foul-smelling urine
- Frequent urge to urinate, sometimes producing only small amounts
- Nausea and vomiting
- Restlessness — many people cannot sit still
- Fever and chills if an infection is present
Severe, Wave-Like Pain
The hallmark of a kidney stone is sudden, sharp pain that comes and goes in waves. The waves happen because the ureter contracts in a rhythm to move the stone. Pain often starts in the back or side, then travels toward the lower belly and groin as the stone moves down.
Blood in the Urine (Hematuria)
As a stone scrapes against the walls of the urinary tract, tiny amounts of blood can leak into the urine. This may look pink, red, or brown — or may be invisible and only picked up on a urinalysis. Blood in the urine is one of the most reliable clues that a kidney stone may be present.
Changes in Urination
Stones near the bladder or blocking urine flow can cause:
- Frequent trips to the bathroom
- A strong, sudden urge to urinate
- Only being able to urinate a little bit at a time
- Burning or discomfort during urination
- Cloudy or bad-smelling urine, especially with infection
Nausea and Vomiting
The kidneys and stomach share nerve pathways, so kidney pain often triggers digestive upset. Many people assume they have a stomach bug at first, only to discover a stone was the real cause.
Restlessness
Unlike abdominal pain from many other conditions, kidney stone pain often gets no better with rest. People frequently pace, shift positions, or squirm because no position feels comfortable.
A Typical Symptom Timeline
Every case is different, but a common pattern looks like this:
- Silent phase. The stone forms inside the kidney with no symptoms.
- First wave of pain. The stone moves into the ureter, triggering sudden flank pain.
- Peak symptoms. Pain intensifies in waves, often with nausea, sweating, and blood in the urine.
- Migration. Pain moves down toward the groin as the stone travels lower in the ureter.
- Bladder phase. Frequent urge to urinate and burning as the stone nears the bladder.
- Passage or intervention. The stone passes in the urine, or medical treatment is needed.
Kidney Stone Symptoms in Women vs. Men
The core symptoms are the same, but the location and pattern of pain can be misleading:
- In women, stone pain can be mistaken for urinary tract infection, ovarian cysts, endometriosis, or menstrual cramps.
- In men, pain radiating into the groin or testicle can be mistaken for prostate issues, hernia, or testicular problems.
This overlap is why imaging (usually a low-dose CT scan or ultrasound) is important for an accurate diagnosis.
Symptoms Based on Stone Location
| Stone Location | Typical Symptoms |
|---|---|
| Inside the kidney | Often no symptoms; occasional dull ache in the back or side |
| Upper ureter (near the kidney) | Sharp flank pain; back pain; nausea |
| Middle ureter | Pain radiating from the side toward the lower abdomen |
| Lower ureter (near the bladder) | Groin pain; urinary urgency; burning; frequent urination |
| In the bladder | Discomfort with urination; difficulty emptying the bladder |
Symptoms That Signal an Emergency
Some symptoms can indicate a dangerous complication — such as infection or complete blockage — and need urgent care. Go to an emergency room or call your doctor right away if you experience:
- Severe pain you cannot control at home
- Fever above 100.4°F (38°C) or chills
- Persistent vomiting or inability to keep fluids down
- Inability to urinate
- Dizziness, fainting, or rapid heartbeat
- Foul-smelling urine with pain (possible infection)
- Only one working kidney, kidney transplant, or advanced kidney disease
An infected, obstructing kidney stone is considered a urologic emergency. It can rapidly turn into a serious bloodstream infection if not treated.
How Doctors Confirm It's a Kidney Stone
Because kidney stone symptoms can mimic other conditions, diagnosis usually involves:
- Physical exam and history — including a description of the pain pattern.
- Urine tests — checking for blood, crystals, and infection.
- Blood tests — evaluating kidney function and mineral levels.
- Imaging — most commonly a low-dose CT scan (very sensitive) or ultrasound (no radiation, often used in pregnancy or children).
- Stone analysis — if you pass a stone, the lab can identify its type, which helps guide prevention.
Knowing the type of stone matters because different stones respond to different dietary strategies — a topic covered in more detail in our guide to the types of kidney stones.
What to Do at Home While Waiting for Care
If your provider has confirmed a small stone and instructed you to try to pass it at home, these steps usually help:
- Drink plenty of water — aim for pale yellow urine.
- Take medications only as prescribed (never combine painkillers without guidance).
- Strain your urine through a coffee filter or fine strainer to catch the stone for testing.
- Move gently — walking may help stones progress.
- Watch for warning signs (fever, uncontrolled pain, inability to urinate) and call your provider if they appear.
Symptoms After the Stone Passes
Even after a stone has passed, some people experience:
- A day or two of mild lingering discomfort
- Trace blood in the urine for up to a few days
- Feeling drained or shaky from the acute pain episode
Follow-up matters. If you have had one stone, your risk of forming another is significant, and this is the right moment to build a long-term prevention plan.
How to Lower the Odds of Future Symptoms
Prevention centers on a few core habits:
- Drink enough water throughout the day, every day
- Moderate sodium — most extra sodium hides in packaged foods
- Get adequate calcium from food (not just supplements)
- Balance animal protein with plant-based sources
- Eat plenty of fruits and vegetables
- Limit sugary drinks, especially colas
- Address any underlying medical conditions
For step-by-step guidance, see our detailed kidney stone prevention guide.
References
- National Kidney Foundation — Kidney Stones: Causes, Symptoms, and Treatment.
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK / NIH) — Kidney Stones.
- Mayo Clinic — Kidney Stones: Symptoms and Causes.
- Cleveland Clinic — Kidney Stones: Signs, Causes, and Treatment.
- American Urological Association — Kidney Stones: Patient Guide.
The Bottom Line
Kidney stone symptoms usually appear suddenly and can be intense — but they are also recognizable once you know the pattern. Sharp, wave-like flank pain, blood in the urine, and urinary changes are the classic warning signs. Get evaluated whenever these symptoms show up, and treat any red flags like fever or inability to urinate as an emergency. With the right diagnosis and a solid prevention plan, most people can dramatically reduce their chances of another episode.
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