Why Is My Pee Green? Here Are the Causes, Medication, and Myths

The appearance, color, and smell of urine can vary based on factors such as hydration levels and diet, as well as certain medical conditions like urinary tract infections. While it is unusual, green urine can sometimes occur. This article will discuss ten potential causes of green urine, but only two of them typically cause concern and are relatively rare.

Green urine can be surprising and may cause concern, but it is not usually a serious issue. According to Dr. Kelly Johnson-Arbor, a toxicologist and medical co-director for the National Capital Poison Center, changes in the color and odor of urine are common due to the kidneys constantly filtering waste products from the blood. Green urine is often caused by dyes found in food, medicine, and personal care products like mouthwash, according to Dr. Anurag K. Das, a urology leading physician from Staten Island University Hospital. In rare cases, however, green urine may be a sign of liver disease or a urinary tract infection.

Certain medications can cause the color of urine to change to green due to a chemical reaction. The blue pigment found in these medications mixes with the natural yellow color of urine, resulting in a green or bluish-green appearance. This color change is often caused by the presence of a "phenol group" in the chemical structure of the drug. When the body breaks down these drugs, it produces blue pigments in the urine, which mix with the yellow urochrome pigments to produce green urine. This effect is temporary and is not usually cause for concern.

Medication and Myths

Medical products and anesthetics used during surgery or other in-office medical procedures can contain colored dyes that may cause urine to appear green. Some examples of medications that may cause green urine to include Methylene blue, which is found in many over-the-counter pain relief medications and is used in surgical procedures; Indomethacin, an NSAID medication used to treat arthritis; Amitriptyline, an antidepressant; and Propofol, an anesthetic. These medications can cause the color of urine to change temporarily and do not typically indicate a serious health issue.

While green urine caused by medication is generally not a cause for concern, two rare causes of green urine may be serious. One of these is a urinary tract infection caused by the bacteria Pseudomonas aeruginosa, which can produce a blue pigment called pyocyanin that can give urine a bluish-green color. The other serious cause of green urine is jaundice, which is a condition characterized by a buildup of bile in the blood that can cause yellowing or greenish discoloration of the skin, eyes, and urine. Jaundice can be a sign of serious problems with the liver, pancreas, or gallbladder. If you are experiencing green urine and are concerned about your health, it is important to consult with a healthcare professional.

There is a common belief that consuming asparagus can cause a greenish tinge to urine, but there is limited scientific evidence to support this claim. Some people may notice a typical asparagus smell in their urine after consuming this vegetable, but this is not related to the color of the urine. Additionally, while vitamin B complex supplements contain the yellow-green fluorescent pigment riboflavin (vitamin B2), this typically causes urine to turn a brighter yellow rather than green. If you are concerned about the color of your urine, it is important to consult with a healthcare professional for a proper evaluation.

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If you notice that your urine is a different color, chances are it could be from what you've eaten or drank that day.

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Urine Color Indicator

Following an Insider report, healthy urine is typically a pale, clear yellow color and may become darker and have a stronger smell when you are dehydrated. However, if you notice that your urine is consistently dark yellow, orange, brown, red, or tinged with blood, it may be a sign that there is something else going on. It is important to pay attention to other urinary characteristics, such as frequency of urination, the volume of urine produced, appearance (cloudy or foamy), and changes in smell (strong, unpleasant, sweet).

If you notice any notable or consistent changes in these characteristics, it is a good idea to see a healthcare provider. A simple urine test can often determine if there is an underlying issue. It is normal for the color and other characteristics of urine to vary to some extent, and in most cases, green urine is not a cause for concern.

However, if you continue to notice green urine or other changes in your urine after the color change is no longer being caused by a new medication or the consumption of green-colored foods, it is a good idea to see a healthcare provider for further evaluation. Your provider can perform some simple tests to determine if there is an underlying issue causing the changes in your urine. It is important to seek medical evaluation if you are concerned about your health or if you experience any other unusual or concerning symptoms.