Urine odor refers to the smell from your urine. Urine odor varies. Most of the time, urine does not have a strong smell if you are healthy and drink plenty of fluids.

Most changes in urine odor are not a sign of disease and go away in time. Some foods and medicines, including vitamins, may affect your urine's odor. For example, eating asparagus causes a distinct urine odor.

Foul-smelling urine may be due to bacteria. Sweet-smelling urine may be a sign of uncontrolled diabetes or a rare disease of metabolism. Liver disease and certain metabolic disorders may cause musty-smelling urine.

Some conditions that can cause changes in urine odor include:

• Bladder fistula
• Bladder infection
• Body is low on fluids (concentrated urine can smell like ammonia)
• Poorly controlled diabetes (sweet smelling urine)
• Liver failure
• Ketonuria

Contact your health care provider if you have signs of a urinary tract infection with abnormal urine odor. These include:

• Fever
• Chills
• Burning pain with urination
• Back pain

You may have the following tests:

• Urinalysis
• Urine culture

Gharavi AG, Landry DW. Approach to the patient with renal disease. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 100.

Navarro D, Fonseca NM, Garigali G, Fogazzi GB. Urinalysis. In: Johnson RJ, Floege J, Tonelli M, eds. Comprehensive Clinical Nephrology. 7th ed. Philadelphia, PA: Elsevier; 2024:chap 4.

Riley RS, McPherson RA. Basic examination of urine. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 29.