Monarch Disease Ontology term MONDO_0800385 (iron poisoning) can be described as follows. A heavy metal poisoning that is caused by exposure to iron. Iron toxicity is classified as corrosive or cellular. Ingested iron can cause direct caustic injury to the gastrointestinal mucosa, resulting in nausea, vomiting, abdominal pain, and diarrhea. Also known as: iron overload, iron toxicity.