Cloudy urine with a strong odour: what to know

A strong odour often becomes more noticeable when urine is concentrated. Foods, vitamins and medicines can also alter smell. Cloudiness may be caused by salts, crystals, mucus or cells, so smell and appearance do not identify one diagnosis. A urinary tract infection can present with cloudy, unpleasant-smelling urine and may also cause urgency, frequency or burning. A kidney infection is more concerning when fever, chills, nausea, or side or back pain appear. Learn more from [Cloudy Urine](/symptoms/cloudy-urine/) and [Urinary Tract Infection](/conditions/urinary-tract-infection/).

Drink fluids regularly unless you have a medical fluid restriction, then see whether the odour and cloudiness settle. Think about recent foods, supplements and medicines, but do not stop prescribed treatment without advice. Note any urinary discomfort, urgency, frequency, discharge, blood, fever, nausea or pain. If the change persists, keeps returning, or is accompanied by other symptoms, arrange an appointment. A urine sample can help a clinician decide whether infection or another cause needs treatment.

Seek prompt care if the strong odour and cloudiness occur with fever, chills, side or back pain, vomiting, confusion, visible blood, or difficulty passing urine. These features can signal a more serious urinary problem. Arrange routine assessment when the change does not settle with normal hydration, or when burning, urgency, frequency or discharge develops. Kidney infection symptoms warrant prompt review; see [Kidney Infection](/conditions/kidney-infection/).

Could food, medication, or dehydration explain the smell? Do I need a urine test? Which symptoms would make this urgent? If the result is normal, what other causes should we consider?