Usually, brown/dark urine can mean an infection, or blood in the urine. It also means to drink more water. Normal urine should be light yellow or clear.
What Does Brown/dark Yellow Pee Mean?
Bladder infection
Having dark yellow or brown pee could be caused by a liver disease. If your skin is also yellow and the whites of your eyes are to you shoud seek medical attention asap cause this could be a sign of liver failure. Although rare it can happen. I would definetly go to the emergency room or see a dr. The same day this accures.
Kidney infection