Foul-Smelling Urine: A Common Sign of Urinary Tract Infection

A strong, foul odor in urine is a classic symptom of a urinary tract infection (UTI), especially when the infection involves the lower urinary tract (bladder and urethra). Along with the smell, urine often appears cloudy or darker than usual.

The unpleasant odor results from bacteria—most commonly E. coli—entering the urinary tract and multiplying. As these bacteria metabolize nutrients in the urine, they produce waste products such as ammonia and sulfur compounds, which create the characteristic strong smell.

Other typical UTI symptoms include a burning sensation during urination, frequent or urgent need to urinate, pelvic discomfort, and sometimes fever. If you notice persistent foul-smelling urine along with any of these signs, consult a healthcare provider for a urine test and appropriate antibiotic treatment.