A member asked:

Urinate normal colored urine but it turns black if exposed to air for longer periods of time. i have no other symptom. what is the cause?

A doctor has provided 1 answer

? Alkaptonuria: Alkaptonuria could be the cause and is a genetic disorder so need to see a physician to diagnosis if this is a possibility.Overtime can cause problems with joints if this is the cause and not treated.

Answered 1/26/2019

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