Foul-smelling and cloudy urine: what to know

A strong smell may appear when urine is concentrated after not drinking enough. Food, supplements, and some medicines can also alter odour. Cloudiness may come from crystals, mucus, or cells in the urine. A urinary tract infection can present with cloudy urine and a strong smell, often alongside burning, frequent urination, urgency, or lower abdominal discomfort. A kidney infection can present with urinary changes plus fever, chills, nausea, or pain in the side or back. Cloudy Urine can help you compare related symptoms, but appearance alone cannot identify the cause.

Notice when the change began and whether it follows a new food, supplement, or medicine. Drink fluids normally unless a clinician has given you a fluid restriction, and see whether the next few urine samples look clearer. Do not use leftover antibiotics. If the change persists, returns, or comes with burning or urgency, arrange a clinical assessment; a urine sample may help distinguish infection from other causes. Consider reading about Dehydration and Urinary Tract Infection for related guidance.

Seek prompt medical care for fever, shaking chills, pain in the side or back, vomiting, marked weakness, or feeling suddenly very unwell. These features can accompany a kidney infection and need timely assessment. Contact a clinician soon if cloudy, foul-smelling urine continues, becomes associated with blood, or occurs during pregnancy. Urgent help is appropriate if you cannot keep fluids down or have difficulty passing urine.

Ask whether your symptoms call for a urine test, whether medicines or diet could explain the smell, and which changes should prompt review. Tell the clinician about pain, fever, pregnancy, recent antibiotics, and any new products or supplements.