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What is the cause of bright yellow urine?

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Quick Answer

Using certain medications and vitamin supplements, such as B-complex vitamins, can make urine a bright yellow color, according to WebMD. The color of urine typically depends on the concentration of the yellow pigment called urochrome.

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Full Answer

B2 riboflavin in vitamins can cause a bright yellow color in urine because the body flushes excess B2 through the urine. Urine color also varies depending on what the individual eats and drinks. Beets can turn urine pink or red, and carrots can lend an orange hue. Rhubarb can turn urine into a dark brown color, according to Harvard Health Publications. Dark yellow-colored urine is usually a sign of dehydration, and pale yellow-colored urine means that the individual may be drinking a large amount of water. Asparagus can give urine a green color and a bad odor. Rifampin is a tuberculosis medication that can cause red or orange urine, and Diprivan is a drug that can turn urine green or blue, notes Mayo Clinic.

Urine color can also change if an underlying medical condition is present. Porphyria causes urine to become purple, and an infection or cancer can cause blood to be expelled in urine, making the urine red or pink-colored. Chronic exposure to lead or mercury poisoning can turn urine red, states Mayo Clinic. Urinary tract infections that are caused by bacteria can cause green-colored urine.

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