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Cloudy or strong-smelling urine
Category: Urinary & Kidneys · All urinary symptoms
What it can feel like
Cloudy urine looks milky or hazy rather than clear, and strong-smelling urine has a noticeably pungent odour. On their own, without other symptoms, these changes are usually about concentration and diet rather than infection — context is everything.
Possible causes
A symptom can have many causes, and most are not serious. The lists below group conditions this symptom can be associated with — common causes first. They are possibilities to discuss with a clinician, not a diagnosis.
Common causes
Cloudiness and smell can be associated with not drinking enough (concentrated urine), foods such as asparagus, coffee, vitamin supplements, and harmless crystals that form as urine stands or cools.
Other possible causes
Cloudy urine with burning, frequency or fever can be associated with urinary infection. Persistently cloudy urine can also reflect excess protein or phosphate, and milky urine with blood can occur with stones or, rarely, other tract problems.
Red flags — when to seek help promptly
- Cloudy urine with fever, shivering or side pain — urgent
- Cloudy urine with visible blood
- Cloudy urine with burning that persists more than a day or two
- Cloudy urine in pregnancy, or in a young child who is unwell
What a clinician may do
A clinician will dipstick and often culture a fresh urine sample, asking about fluids, diet, supplements and other symptoms. If you feel otherwise well, the test result — not the appearance — decides whether antibiotics are needed.
Related guides on MedicalVideos.com
Frequently asked questions
Does smelly urine mean I have an infection?
Not necessarily. Concentrated morning urine smells stronger, and foods and vitamins change odour within hours. Infection is about the company it keeps — burning, frequency, fever, pain. Testing is quick and settles it.
Why shouldn't I just take leftover antibiotics?
Because treating appearance rather than infection breeds resistance and misses the real cause. In older people especially, bacteria can live in the urine harmlessly; guidelines advise treating symptoms, not cloudy urine alone.
Related symptoms — Urinary & Kidneys
Browse the C section of the A–Z list or return to the Symptoms A–Z hub.