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Blue Pee

Published: May 14, 2012
Dear TeenHealthFX,

I was wondering what would make a person pee blue. I'm asking this question because I did pee blue yesterday. Please help.

Signed: Blue Pee

Dear Blue Pee,


Actually there are several reasons medical reasons why a person’s urine could be blue:

  • Blue or green urine may be caused by a blue dye such as methylene blue, a component in several medications (Trac Tabs, Urised, Uroblue) used to reduce symptoms of bladder inflammation or irritation.
  • Amitriptyline, indomethacin, resorcinol, triamterine, cimetidine, phenergan, and several multivitamins also lend a blue-green tint to the urine
  • Administration of the dye, indigo carmine, turns the urine blue/green and can last for several days if kidney function is poor,
  • An inherited form of high calcium (called "familial hypercalcemia") can result in blue urine, which has lent this disease the nickname "blue diaper syndrome”
  • A blue pigment may also be produced by infection with the bacteria Pseudomonas.

There are pranksters out there who have used methylene blue dye added to chocolate cake or brownies or to beverages as way of playing a joke on some unsuspecting person. TeenHealthFX strongly cautions our readers not to engage in this activity because it could have severe medical complications for the victim.


Another blue dye, FD & C Blue No. 1 also known in Canada as Brilliant Blue FCF, which is used in hospitals for enteral feeds can be lethal. The United States Food and Drug Administration (US FDA) on September 29, 2003 issued a statement warning against this dye because it was linked to severe complications including death.


TeenHealthFX thinks that it would be best if you checked with your doctor about your condition. Let him/her know about any medications or vitamin supplements you have been taking. Even if you find that you have been the victim of a prank you should still consult with your doctor and let him/her decide if any further investigation is warranted.


If you don't have a doctor and live in northern New Jersey, you can call the Adolescent/Young Adult Center for Health at 973-971-5199 for an appointment or contact your local teen health center.

Signed: TeenHealthFX