If the inside of your microwave is rusted can it harm food?

Yes. Rust is iron oxide, which can flake off and contaminate food. Consuming rust can cause abdominal pain, nausea, and vomiting. It can also be harmful to people with iron-deficiency anemia, as it can interfere with the absorption of iron. In addition, rust can damage the coating of the microwave, which can lead to further problems.