What should you know about urine that smells sour and looks cloudy?

Urine can look cloudy when it contains crystals, mucus, cells, or other material. A strong sour or ammonia-like smell may occur when urine is concentrated, such as after drinking less fluid. Food, vitamins, and medicines can also alter odour. Cloudiness with burning when passing urine, frequent urges, lower abdominal discomfort, or blood can fit a urinary tract infection. A kidney infection presents with fever, chills, side or back pain, nausea, or feeling markedly unwell; cloudy urine alone does not establish that diagnosis.

Drink water regularly unless a clinician has told you to restrict fluids, and notice whether the colour, smell, and cloudiness change over the next day. Do not use leftover antibiotics or someone else’s medicine. If the change persists, recurs, or comes with urinary discomfort, arrange a urine assessment. Read more about [Cloudy Urine](/symptoms/cloudy-urine/) and [Urinary Tract Infection](/conditions/urinary-tract-infection/).

Seek prompt medical care for fever, shaking chills, pain in the side or back, vomiting, visible blood, confusion, or difficulty passing urine. These features can signal a more serious urinary problem. Seek urgent help if you feel faint, severely unwell, or cannot keep fluids down. [Kidney Infection](/conditions/kidney-infection/) and [Dehydration](/conditions/dehydration/) provide related information.

Ask whether you need a urine dipstick or culture, whether your medicines or diet could explain the odour, and which symptoms should prompt same-day review. Mention when the change began, fluid intake, pain, fever, discharge, pregnancy, and any history of urinary infections.