An inherited disorder that affects the metabolism of the amino acids. Representative examples include alkaptonuria, homocystinuria, tyrosinemia, and phenylketonuria. The disease is Monarch Disease Ontology id MONDO_0004736 (inborn disorder of amino acid metabolism). Also known as: inborn cellular amino acid metabolic process disorder, inborn error of amino acid metabolism, inborn error of cellular amino acid metabolic process, inborn errors of amino acid metabolism, inherited amino acid metabolic disorder, rare inborn error of cellular amino acid metabolic process.