Urinary System

Urine and Its Formation

Is urine always yellow in color?

Normally, dilute urine is nearly colorless. Concentrated urine is a deep yellow; colors other than yellow are not normal. Food pigments can make the urine red, and drugs can produce colors such as brown, black, blue, green, or red. Urine may also be brown, black, or red due to disorders or diseases such as severe muscle injury or melanoma. Cloudy urine suggest the presence of pus, due to a urinary tract infection, or salt crystals from uric acid or phosphoric acid.


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