The following are possible causes of foul-smelling urine in women: 1. urinary system infections such as cystitis and pyelonephritis, when there are more pus cells in the urine or more bacterial metabolites, the urine will be smelly and may be accompanied by symptoms of frequent urination, urinary urgency and painful urination. 2. sexually transmitted diseases can also lead to smelly urine. The urine can also be foul-smelling, such as gonorrhea or non-gonococcal urethritis, where the pathogenic bacteria multiply in the urine and cause foul-smelling urine, while the urethra discharges yellow purulent secretions, which need to be tested for sexually transmitted diseases to further confirm the diagnosis, especially in patients with a history of unclean sexual contact. 3. If you can exclude tofu-like substances or with urinary bleeding, you need to perform further ultrasound of the urinary system and tuberculin-related tests to further confirm the diagnosis.