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Fix SoonNot an emergency, but worth addressing within a few days.
Strong-smelling urine is usually caused by dehydration, diet, or supplements — and resolves quickly on its own. But certain persistent odors can signal a UTI, uncontrolled diabetes, or kidney disease. Here's how to tell the difference.
The most common cause of strong urine smell by far. Urine is a concentrated mixture of water, urea, creatinine, and salts filtered from the blood by the kidneys. When you don't drink enough water, the same amount of waste is dissolved in less water — producing darker, more concentrated urine with a strong ammonia-like smell. Urea is a waste product made of ammonia and carbon dioxide, and its concentration directly correlates with how strongly your urine smells. The fix is simple: drink more water.
Signs this is the cause: Urine is dark yellow or amber rather than pale; smell is ammonia-like; improves within hours of drinking water; worse in the morning before your first drink.
How to fix it
Drink 60–80 ounces (1.8–2.4 liters) of fluid per day — spread throughout the day, not all at once
Aim for pale yellow urine as a real-time hydration indicator
Increase intake during exercise, hot weather, illness, or alcohol consumption, all of which accelerate fluid loss
Coffee, tea, and alcohol count as fluids but are mildly diuretic — balance them with plain water
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Foods & Diet
Easy Fix
Many foods contain sulfur compounds or other volatile molecules that are excreted in urine after digestion. Asparagus is the most famous — it contains asparagusic acid, which the body converts into sulfur-containing compounds that cause a distinctive smell within 15–30 minutes of eating. Cruciferous vegetables (Brussels sprouts, broccoli), garlic, onions, cumin, and fish can all produce strong-smelling urine. The smell resolves on its own within 24–48 hours as the compounds are cleared.
Signs this is the cause: Smell developed after eating specific foods; no other symptoms; resolves within 24–48 hours without intervention.
How to fix it
The smell from food is temporary and harmless — no treatment needed
Drink extra water to flush the compounds faster
If the smell bothers you, reduce intake of known trigger foods (asparagus, cruciferous vegetables, garlic, onions)
Note: roughly 40–60% of people have a genetic variant that prevents them from smelling asparagus in their own urine — so not everyone notices it
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Vitamins & Medications
Easy Fix
B vitamins — particularly vitamin B6 (pyridoxine) and B1 (thiamine) — are water-soluble, meaning the body doesn't store excess amounts. Whatever you don't need is excreted through urine, often producing a distinctive, slightly fishy or pungent smell. Most multivitamins contain high doses of B vitamins and are a frequent overlooked cause of strong-smelling urine. Certain medications, especially sulfonamide antibiotics (sulfa drugs) and some diabetes medications (sulfonylureas), can also cause urine to smell like sulfur or rotten eggs.
Signs this is the cause: Smell developed after starting a new supplement or medication; urine is bright yellow (classic with B vitamins); smell is consistent regardless of hydration status.
How to fix it
If B vitamins are the cause, this is harmless — the smell will resolve if you stop the supplement or reduce the dose
Check your multivitamin label; if it contains more than 100% DV of B vitamins, that's likely the culprit
If a prescription medication is causing the smell, discuss with your doctor before stopping — don't discontinue medications without medical advice
Increasing water intake helps dilute and clear the compounds more quickly
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Urinary Tract Infection (UTI)
Act Now
A UTI is the most common medical cause of foul-smelling urine. Bacterial infection — most commonly E. coli — causes the breakdown of ammonia already present in urine, producing a particularly pungent, foul odor. The bacteria also produce their own volatile compounds as metabolic byproducts. UTIs send approximately 10 million Americans to healthcare providers annually. Women are significantly more susceptible due to shorter urethra anatomy. Left untreated, UTIs can progress to kidney infections.
Signs this is the cause: Strong or foul smell accompanied by burning or pain during urination, frequent urge to urinate, cloudy or bloody urine, pelvic pressure; sometimes low-grade fever.
How to fix it
See a healthcare provider promptly — UTIs require antibiotic treatment and typically clear within 3–7 days
Drinking plenty of water helps flush bacteria but does not replace antibiotic treatment
Cranberry supplements may help prevent recurrent UTIs but are not a treatment for active infection
After treatment, drink 6–8 glasses of water daily to maintain urinary tract health
Women: wipe front to back, urinate after sex, and avoid irritating products near the urethra to prevent recurrence
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Uncontrolled Diabetes
Act Now
When blood sugar levels are chronically elevated (as in uncontrolled Type 1 or Type 2 diabetes), the kidneys excrete excess glucose into the urine, creating a sweet or fruity smell. In more severe cases — particularly diabetic ketoacidosis (DKA), a medical emergency — the body breaks down fat for fuel, producing ketones that are excreted in urine with a distinctive sweet-acetone smell. Certain diabetes medications (sulfonylureas) can also alter urine odor independently of blood sugar levels.
Signs this is the cause: Urine smells sweet or fruity rather than ammonia-like; accompanied by increased thirst, frequent urination, unexplained weight loss, or fatigue — all classic diabetes symptoms.
How to fix it
Seek medical evaluation immediately if urine smells sweet/fruity and you have not been diagnosed with diabetes — this warrants urgent blood sugar testing
If you have diabetes, work with your doctor to optimize blood sugar control — the odor resolves when glucose is managed properly
Do not attempt to self-diagnose or treat diabetes based on urine smell alone
If accompanied by nausea, vomiting, abdominal pain, and confusion, go to an emergency room — these may indicate DKA, a life-threatening emergency
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Kidney Disease
Act Now
Healthy kidneys filter urea and other waste products from the blood, excreting them in urine. When kidneys are damaged or failing — from chronic kidney disease (CKD), kidney stones, or acute kidney injury — urea and other toxins accumulate in the bloodstream. This uremia causes a very strong ammonia smell in urine (and sometimes even on the breath). Chronic kidney disease affects over 37 million Americans, often without obvious symptoms until the disease is moderately advanced.
Signs this is the cause: Strong ammonia smell despite adequate hydration; accompanied by fatigue, swelling in legs/ankles, decreased urine output, high blood pressure, or nausea; smell persists regardless of diet changes.
How to fix it
See a healthcare provider if you have persistent ammonia-smelling urine with no obvious dietary cause — kidney disease requires blood and urine tests to diagnose
CKD management includes dietary changes (limiting protein and potassium), blood pressure control, and sometimes dialysis
Stay well hydrated to support kidney function unless your doctor has restricted fluids
Kidney stones causing odor require evaluation — some pass on their own, others require medical treatment
Regular check-ups with blood pressure monitoring are key for early detection of kidney problems
Frequently Asked Questions
Is strong-smelling urine always a sign of a problem?
Not at all. The most common causes — dehydration, asparagus, B vitamins, and certain medications — are completely harmless. Strong urine smell only warrants concern when it is accompanied by other symptoms like pain, burning, fever, excessive thirst, or unusual color; or when it persists despite adequate hydration and no dietary explanation.
What does urine smell like with a UTI?
UTI urine typically has a strong, unpleasant foul smell rather than a simple ammonia odor. It's often described as "putrid" or distinctly abnormal. It's almost always accompanied by other symptoms — burning during urination, frequent urge to go, cloudy urine, and sometimes pelvic discomfort.
Why does my urine smell sweet or fruity?
Sweet or fruity-smelling urine is most commonly associated with high blood sugar — either undiagnosed diabetes or uncontrolled existing diabetes. The kidneys excrete excess glucose into the urine, which can smell sweet. This warrants prompt medical evaluation, especially if accompanied by excessive thirst, frequent urination, or unexplained weight loss.
Does coffee make urine smell?
Yes. Coffee is metabolized into compounds including caffeic acid and certain sulfur metabolites that are excreted in urine, creating a distinctive coffee-like smell. This is harmless and temporary. Coffee is also a mild diuretic, which can increase urine concentration and intensify odor slightly if you're not drinking enough water alongside it.
When should I see a doctor about urine smell?
See a doctor if strong urine smell is accompanied by: burning or pain when urinating, fever or chills, cloudy or bloody urine, persistent sweet/fruity smell without dietary explanation, strong ammonia smell despite drinking plenty of water, or symptoms of diabetes (excessive thirst, frequent urination, fatigue, unexplained weight loss).