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Changes in Color or Odor of Urine

By

Geetha Maddukuri

, MD, Saint Louis University

Last full review/revision May 2021| Content last modified May 2021
Click here for the Professional Version

Normally, dilute urine is nearly colorless. Concentrated urine is deep yellow. Colors other than yellow are abnormal.

Doctors usually can identify the cause of an abnormal color by examining the urine under a microscope or by doing chemical tests.

Drugs can produce a variety of colors: brown, black, blue, green, orange, or red.

Treatment is unnecessary except if needed to treat the underlying disorder.

Brown urine

Brown urine may be caused by broken-down hemoglobin (the protein that carries oxygen in red blood cells). Broken-down hemoglobin can leak into the urine when bleeding occurs in the kidney, ureter, or bladder, or it can be excreted into the urine as the result of certain disorders that damage or destroy red blood cells (hemolytic anemia). Brown urine also may be caused by muscle protein (myoglobin) that is excreted into the urine after severe muscle injury.

Black urine

Urine may be black because of pigments produced by melanoma.

Red urine

Red urine may be caused by blood but it may also be due to food pigments (for example, beets), artificial food coloring, and rarely by porphyria.

Cloudy urine

Cloudy urine suggests the presence of excess white blood cells due to a urinary tract infection, the presence of crystals of salts from uric acid or from phosphoric acid, or the presence of a vaginal discharge.

Malodorous urine

The odor of urine can vary and does not usually indicate a disorder except in people who have certain rare metabolic disorders. For example, concentrated urine can have a strong smell of ammonia. Also, a urinary tract infection can cause foul-smelling urine.

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Test your knowledge

Urethritis
Urethritis is an infection of the urethra, the tube that transports urine out of the body from the bladder. Many organisms can cause urethritis. Which of the following is an organism that commonly causes urethritis in men, but is more likely to infect reproductive organs in women?  
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