Changes in urine color provide a strong indicator of dehydration, according to Mayo Clinic. Urine that is dark yellow or amber-colored is a warning sign of possible dehydration, a potentially life-threatening medical condition.
Urine derives its color from a pigment called urochrome, reports WebMD. When individuals do not drink enough fluids, their bodies retain urine longer in order to perform essential body functions. Urine becomes darker and more concentrated. Deeply pigmented urine serves as an indication that the individual needs to increase fluid intake.
Dark urine can also be a symptom of other medical conditions, including infections or cancer, notes WebMD. Urinalysis can help identify the cause of dark urine.