kidney and urinary tract disorders
Changes in Color or Odor of Urine
Introduction
(See Overview of Urinary Tract Symptoms .) 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. 