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When to contact a doctor A person may wish to contact a doctor if they experience a change in their urine that is not due to eating colored foods or taking medication. This is particularly important if the change lasts more than 1 to 2 days. Frothy or foamy urine may be a sign of a kidney problem. Excessive bubbles in urine, which can be hard to flush, can be a sign of protein in urine, which may indicate kidney disease. People will also need to contact a doctor if they have: cloudy or foul-smelling urine, as this may be a sign of a UTI or other infection an urgent or frequent need to urinate, particularly with increased thirst pain or a burning sensation when urinating urine that remains dark even when a person is sufficiently hydrated bloody urine A healthcare professional can carry out a urine test to identify any abnormal substances in the urine. This can help them determine the underlying cause of changes in the urine. (责任编辑：) |