What is alcaptonuria?
A person with alcaptonuria is unable to process the amino acids, phenylalanine and tyrosine. Alcaptonuria is an inherited disease, but symptoms do not occur until adulthood.

What are the symptoms of alcaptonuria?
Symptoms of alcaptonuria include joint pain, joint swelling, and dark urine.

How does the doctor treat alcaptonuria?
Treatment of alcaptonuria includes vitamin C supplements, and a diet that is low in phenylalanine and tyrosine.