Aminoaciduria is a medical condition characterized by the presence of excess amino acids in the urine. Amino acids are the building blocks of proteins, and normally, the kidneys filter and reabsorb them. When this process is disrupted, it can lead to the excretion of amino acids that should have been retained, indicating a potential metabolic disorder. This condition can result from various factors, including genetic disorders, kidney dysfunction, or certain dietary imbalances. Common types of aminoaciduria include Hartnup disorder and cystinuria, which can lead to symptoms such as kidney stones or growth issues in children. Diagnosis typically involves urine tests to measure amino acid levels.